Muscle of forelimb in cattle

Muscle of forelimb in cattle refer to identify muscles from both the lateral and medial aspects of its different segments. Here, I will help you to identify and describe muscle of the forelimb in cattle with proper diagrams.

Quick answer: Muscles of the forelimb in cattle, identifying muscles from the shoulder, arm, and forearm from both their lateral and medial aspects.

I will provide you with some of the schematic diagrams and techniques, so that you may easily identify the forelimb muscles in cattle. These schematic diagrams and techniques will also work for identifying muscles from the forelimb of the goat, sheep, cow, ox, and buffalo.

But make sure you have a good knowledge of the different bones of the skeleton and segments of the forelimb. Then you can easily understand and match the schematic diagrams and real muscle samples.

Muscle of the forelimb in cattle

It is our first duty to know the name and identify the muscles of the cattle’s forelimb. Then we will go for the description of the specific muscles from the different segments/parts of the cattle’s forelimb.

These similar strategies will be followed to learn cattle/cow muscle anatomy. Here, you will identify the muscles from the following different segments/parts of the cattle’s forelimb –

• Muscles from both the lateral and medial aspects of the shoulder,
• Arm’s muscles from both the lateral and medial aspects, and
• Forearm muscles from both the lateral and medial aspects.

Here, Figure 1 shows the lateral and medial muscles of the cattle’s forelimb.

Don’t worry; most of these muscles’ names are according to the bone’s name, or their position on the specific bone. I will help to learn them easily one by one from the shoulder, arm, and forearm.

Lateral muscles of the cow/cattle’s shoulder

Figure 2 shows the schematic presentation/diagram of the lateral muscles of the cow/cattle’s shoulder.

Thus, it presents the following muscles –

• Deltoides (V-shaped, lateral muscle, immediate after the skin and trapezius),
• Supraspinatus muscle (flattened),
• Infraspinatus muscle (cranially, thick), and
• Teres minor muscle (small, elongated in form).

But, to identify these muscle dissected samples, you might remove the muscles of the neck/muscles of the shoulder girdle. Specifically, you might remove the trapezius muscle as it covers most of the shoulder region.

So, after removing it, three lateral muscles (supraspinatus, infraspinatus, and deltoideus) will be visible. Now, how will you identify these muscles from the shoulder?

Well, you already have a strong knowledge of the osteological features of the scapula that forms the shoulder region. Here, the muscle that is accommodated within the majority of the supraspinatus fossa is termed the supraspinatus muscle.

However, the muscle that is accommodated within the infraspinatus fossa is termed the infraspinatus muscle.

A V-shaped muscle is attached to the cranial and caudal borders and the ventral end of the infraspinatus muscle. It is the deltoideus muscle of the cattle/cow’s shoulder.

Again, a small elongated muscle located below the infraspinatus is the teres minor muscle. It is just caudolateral to the shoulder and also covered by the deltoides muscle.

Here, Figure 3 shows the three important lateral muscles of the cattle’s shoulder.

Medial muscles of the cow’s/cattle’s shoulder

Figure 4 shows the schematic diagram/presentation of the medial muscles from the cow, goat, and cattle’s shoulder.

Thus, you will find the following three important muscles –

• Subscapularis muscle (having three parts),
• Teres major muscle (caudal to subscapularis), and
• Coracobrachialis muscle (medial to the proximal end of the humerus bone).

How to identify: Well, the muscle that is accommodated within the subscapularis fossa of the scapula is the subscapularis muscle. This muscle has three different parts: cranial, middle, and caudal.

A thin, flattened muscle is located along the caudal border of the subscapularis muscle. It is the teres major muscle of the cattle’s shoulder.

However, a small elongated muscle is located at the medial aspect of the proximal end of the humerus bone. It obliquely crosses the shoulder joint and terminates at the medial aspect of the cattle’s humerus bone. This small, elongated muscle is termed the coracobrachialis muscle.

Here, Figure 5 shows the medial muscles of the cattle’s shoulder.

Lateral and medial muscles of the arm/brachium of a cattle

The muscles of the arm region of a cattle can be identified from the lateral aspect layer by layer. Here, Figure 6 shows the schematic presentation of the different muscles of the arm region of a cattle.

The lateral, medial, and cranial aspects of the cattle/cow’s arm present the following muscles –

• Triceps brachii muscle (having 3 heads: long, lateral, and medial),
• Tensor fascia antebrachii muscle (medial to the long head of triceps),
• Anconeus muscle (on the olecranon fossa),
• Brachialis muscle (in the musculospiral groove of the humerus),
• Biceps brachii muscle (cranial aspect of humerus), and
• Pronator teres (medial to the elbow joint).

How to identify the cattle’s arm muscles easily?

Well, first, try to identify the larger triceps brachii muscle in the cattle’s arm.

The triangular area between the scapula and humerus is mostly filled by a larger muscle (Figure 7). It is the triceps brachii that contains three heads named long, lateral, and medial.

But the lateral view only shows the largest triangular long head and the small triangular lateral head. Here, the lateral head is located just lateral to the arm (humerus bone).

Now, you will easily identify all other muscles in the cattle’s arm region.

Well, now cut/ remove the lateral head of the triceps muscle. You will find two muscles –

• A small muscle at the distal end of the humerus: it is known as the anconeus muscle, and
• A large fleshy muscle on the musculospiral groove of the humerus bone: it is known as the brachialis muscle.

However, the cranial aspect of the cattle’s humerus presents an elongated, spindle-shaped muscle. It is the biceps brachii, a prominent muscle that is covered by the brachiocephalicus muscle of the neck in fresh condition.

Finally, the pronator teres is a small, narrow band of muscle in the cattle’s arm. It is located just medial to the elbow joint.

Here, Figure 8 shows the triceps (lateral and medial heads), anconeus, brachialis, and biceps brachii muscles from the arm of a cattle.

Caudal and medial muscles of the cattle’s arm

At the caudo-medial aspect of the triceps brachii, there is a thin strip of muscle. It is the tensor fascia antebrachii of the cattle/cow’s arm.

The medial aspect of the cattle’s arm only presents the medial head of the triceps brachii muscle. Again, you may also identify the coracobrachialis and biceps brachii muscles from the medial aspect of the arm.

Here, Figure 9 shows the tensor fasciae antebrachii, medial head of triceps, coracobrachialis, and biceps brachii muscles.

Exceptions in goat’s arm muscles: sometimes in goats, an accessory head of the triceps muscle can be found.

Forearm and manus muscles in cattle’s forelimb

The forearm (antebrachium) and manus muscles in cattle, cow, sheep, and goat are arranged into two groups –

• Extensor group muscles: these muscles are located at the cranio-lateral aspect of the forearm and manus.
• Flexor group muscles: these muscles are located at the caudo-medial aspect of the forearm and manus.

Here, the extensor group presents four muscles, whereas the flexor group presents five muscles. It is very important to identify regions where you may apply the following technique while studying muscle of the forelimb in cattle –

• Name of the muscles depend on their location and insertion,
• Identifying these muscles first from cranial to lateral, then lateral to caudal, and then to the medial aspect of the arm.

How to name these muscles?

Well, let’s see Figure 10, which shows different directions, aspects of the radius and ulna bones. It also shows the cranial-most muscle, which is called the extensor carpi radialis.

Let’s explain how this name was fixed. Well, first, this muscle is under the cranio-lateral group.

Thus, it is under the extensor group of muscles.

Second, it is located in front of the radius bone.

Thus, it is named according to the location of the bone (radialis).

Third, this muscle inserts on the carpi (carpus region).

Thus, it is called the carpi muscle.

So, the full name = extensor + carpi + radialis = (group’s name+insertion point+location on bone). Most of the extensor and flexor muscles are named in this way. Thus, you should understand the exact location and insertion of the specific muscle in the forearm and manus.

Again, you should always identify and name these muscles serially. It is another important technique that may help you to identify these extensor and flexor muscles easily.

For identifying the extensor group, you may go from cranial to the lateral aspect serially. However, for identifying the flexor muscles, you may go from the lateral to the medial aspect of the forearm serially.

Extensor muscle of the forelimb in cattle

Figure 11 shows the schematic diagram/presentation of the extensor group of muscles from the cattle’s forearm and manus. This schematic presentation is also applicable for identifying muscles from the cow, sheep, goat, and buffalo’s forearms and manus.

It presents the following four muscles –

• Extensor carpi radialis muscle (first),
• Abductor digit I longus (second, distally),
• Extensor digitorum communis (third), and
• Extensor digitorum lateralis (fourth).

Here, the first muscle is located just on the cranial surface of the radius and is considered the largest extensor.

The third muscle possesses two heads (lateral and medial) and is located craniolateral to the forearm. Again, two heads form the common tendon that inserts on the digits.

Thus, they are under the extensor group (located craniolateral to the radius), and

They form the common tendon that insert to digits (communis/digitorum)

Finally, they are together called the extensor digitorum communis.

However, the fourth muscle is located just lateral to the radius, so it is called lateralis. You may also call it the radialis, and obviously, it is under the extensor group due to its location.

Again, it inserts into the digits, and thus it is also called the digitorum. So, the final name for the fourth muscle is extensor digitorum lateralis.

Here, Figure 12 shows the four extensor muscles from the cattle’s forearm and manus segments.

Flexor muscles of the forearm and manus of cattle

Figure 13 shows the schematic diagram/presentation of the five flexor group muscles from the cattle’s forelimb. Again, this schematic presentation is also appropriate for identifying flexor muscles from the forelimbs of the cow, sheep, goat, and buffalo.  

So, the five flexor group muscles are –

• Ulnaris lateralis muscle (first from the lateral aspect),
• Flexor carpi ulnaris muscle (cuadal to ulna),
• Flexor digitorum superficialis muscle (third),
• The flexor digitorum profundus muscle (fourth), and
• Flexor carpi radialis muscle (fifth),

Here, the first muscle is located caudal to the radius and the lateral aspect of the ulna. Thus, it is termed the ulnaris lateralis and considered the first flexor muscle of the cattle’s forearm.

The second muscle is thin, wide, and located caudo-medial aspect of the ulna. Again, it insert to the carpus and is thus named as the flexor carpi ulnaris muscle.

The flexor carpi ulnaris covers the third muscle (flexor digitorum superficialis) and contains two heads. It is located caudo-medial aspect of the forearm and inserts to digits.

This muscle is also superficial compared to the fourth muscle of the flexor group. Thus, it is called the flexor digitorum superficialis muscle.

The fourth muscle consists of three heads and contains similar features to superficial muscles. As it is deep to the superficialis muscle, it is called the flexor digitorum profundus.

Finally, the fifth muscle is most caudomedially to the radius bone. It is under the flexor group, and inserts to carpi/carpus region. Thus, it is the flexor carpi radialis muscle of the cattle’s forearm and manus.

Here, Figure 14 shows the five flexor muscles from the cattle’s forearm and manus segments.

FAQ’s on muscles in the forelimb of cattle

Conclusion

Thus, muscle of forelimb in cattle consist of different muscles with their unique identifying features. It is the best approach to identify these muscles from the cattle’s forelimb in segment basis.

Infraspinatus, supraspinatus, and subscapularis are the important muscles of the shoulder segment. Whereas the triceps, biceps, and brachialis are the unique and essential muscles in the cattle’s arm segment.

Finally, the extensor and flexor muscles from the cattle’s forearm and manus can be easily identified according to their location.

References

• Söderlind et al., Comparative, and functional anatomy of the facial musculature in cattle. Anato Rec., 2026; 1–33. https://doi.org/10.1002/ar.70124 
• Nora et al., Comparative Veterinary Anatomy, Academic Press, 2022.
• Gadzhev, Anatomy of Domestic Animal, vol 1, eds St. Gadzhev, Jusautor Sofia, 2000, pp. 176–177, pp. 304–312, pp. 336–337. (BG).
• Georgi et al., comparative morphological study of the locomotor apparatus of the thoracic and pelvic limbs of the buffalo and cattle. Tradition and modernity in veterinary medicine, 2022, 7:2(13): 76–83,
• Ghosh, R. K. : Primary veterinary anatomy, 2nd Edn.Current Books International, Kolkata.
• Rowen D. Frandson, W. Lee Wilke, and A. Dee: Anatomy and physiology of farm animals, 4th edn.Wiley-Blackwell, USA.
• Getty, R,. SG The anatomy of the domestic animals, 5th Edn. W. B. Saynders and Co. Philadelphia (USA).
• Nickel, R. Schummer, A. and Seiferle, E.: The anatomy of domestic animals, 1st Edn. Verlag Paul Parey, Berlin.
• Hermanson et al., Miller and Evan’s Anatomy of the dog, 5th Edn. Elsevier.
• Mcleod, W. N.: Bovine anatomy, 2nd Edn. Burgess Publishing Co. Minneapolis.
• Dyce, K. M., W. O. Sack and CSG Wensing : Textbook of Veterinary Anatomy, Lea & Febiger. Philadelphia