Parts of the forelimb in cattle 

The forelimb of a cattle refers to the front limb of its skeleton. In this guide, I will discuss the parts of the forelimb in cattle and their bones.

Quick answer: The parts of the forelimb in cattle are the shoulder girdle (pectoral), arm (brachium), forearm (antebrachium), and manus (carpus, metacarpals, and phalanges).

If you have the basic knowledge of the bones of the cow’s skeleton, then it is very easy for you. Let’s identify the different parts or segments of the forelimb in cattle with their bones.

What are the parts of the forelimb in cattle?

The appendicular skeleton of a cow consists of the bones of the forelimbs and hindlimbs. Here, the forelimb is the front limb, where the hindlimb is the  back leg of the cow or any animal.

Figure 1 shows the forelimbs and hindlimbs of cattle as well as their skeleton.

The right and left forelimbs of the cattle are structurally symmetric and consist of the following bones –

• Scapula (first bone from the proximal part; cranio-ventrally directed),
• Humerus (below the scapula; caudo-ventrally directed),
• Radius and ulna (below the humerus; almost vertically directed),
• Six carpal bones (arranged in two rows – proximal and distal),
• Fused larger metacarpals (III and IV; vertically directed),
• Small metacarpal II (attaches to the caudolateral aspect of large metacarpals), and
• First, second, and third phalanges in each developed digit,

Figure 2 shows the bones from the right and left forelimbs of the cattle skeleton.

I hope this figure helps you to perfectly identify all the forelimb bones from the cattle skeleton. Now, you may divide the forelimbs into different parts or segments for description purposes.

Parts of the forelimb in cattle

The parts of the forelimb in a cattle are –

• Pectoral girdle (shoulder girdle): It consists of the scapula, clavicle, and coracoid. But the clavicle is absent in cattle, and the coracoid is underdeveloped, which is located at the distal end of the scapula bone (medial aspect of the tuber scapulae).
• Arm part (brachium region): it consists of the humerus bone, which is located obliquely downward and backward. This bone of the cattle forms the shoulder joint above with the scapula, and the elbow joint below with the radius and ulna.
• Forearm part (antebrachium region): This part of the forelimb consists of fused radius and ulna bones. The ulna of a cattle is illdeveloped bone that attaches to the caudolateral aspect of the radius bone.
• Manus part: it is the last part of the cattle’s forelimb and consists of six carpals, large and small metacarpals, and two digits (each contains three phalanges: proximal, middle, and distal). Again, the proximal and distal sesamoid bones are also included within this manus part of the cattle’s forelimb.

Figure 3 shows the different parts or segments of the forelimb in the cattle.

Here, the proximal sesamoid bones are 4 in number in each forelimb. They are located at the palmar aspect between the carpo-metacarpal articulation of the cattle’s forelimb.

Again, like other domestic mammals, you will find two distal sesamoid bones in the cattle’s forelimb. Thus, each digit of the cattle’s forelimb consists of only one distal sesamoid bone.

Why are the parts of the forelimb in cattle important?

To know the parts of the forelimb in cattle is important for beginner veterinary anatomy learners for the following reasons –

• Identify parts from the live animal and understand the bones’ position: students can easily identify the different regions of the forelimb from the live cattle or other animals. They can easily understand and identify the bones of that specific region or segment with their proper position.
• Understanding regional anatomy: while you will read the courses of nerves and vessels of the cattle’s forelimb, you might know the segments of this limb. You should read the course of nerves and vessels of the forelimb according to the segment or parts. This is the best way to memorize the courses of the forelimb’s vessels and nerves.

Quick identification of bones from the forelimb in cattle

Let’s see the quick identification points for the forelimb’s bones in the cattle –

Cattle scapula bone

The cattle’s scapula is a relatively flat triangular bone possess 2 surfaces, 3 borders, and 3 angles. There is a ridge on the lateral surface of the cattle’s scapula, which is also known as the spine.

This spine / ridge divides the lateral surface into the upper supraspinatus fossa and lower infraspinatus fossa. The dorsal border is proximal, and the glenoid cavity is ventral in position.

Humerus of the cattle

The humerus is the first long bone (proximal to distal end aspect) of the cattle’s forelimb, which consists of a shaft and two extremities. Here, the proximal end of the cattle humerus consists of a rounded, articular head that form scapulohumeral joint with the distal end of the scapula bone.

Again, the distal end of the cattle’s humerus consists of cranial condyles and caudal olecranon fossa. This end form humero-radioulnar joint with the proximal end of the cattle’s radius and ulna bones.

Finally, the lateral surface of the shaft of the cattle’s humerus possesses a musculospiral groove (unique in the humerus).

Figure 4 shows the key identifying features of the cattle scapula and humerus bones.

The radius and ulna bones of the cattle’s forelimb

The fused radius and ulna are the bones of the forearm or antebrachium of the cattle’s forelimb. Here, the radius bone is larger in cattle, and the ulna attaches to the caudolateral aspect of this bone.

The cattle’s radius bone forms the elbow joint proximally with the humerus and tarsus joint (knee) with tarsal distally. Again, this bone can be felt directly beneath the skin on the medial aspect of the cattle’s forearm.

The most unique feature of the cattle ulna bone is the proximal olecranon process. This structure faces caudal to the elbow joint of the cattle’s forelimb. The olecranon process is also known as the point of the elbow and acts as a landmark for the auscultation site for the cattle’s heart.

Bones of the manus in cattle’s forelimb

The six carpals (arranged in two rows), small and large metacarpals, and phalanges of the digits form the manus in the cattle’s limb. Here, the proximal row carpals are radial, intermediate, ulnar, and accessory in cattle (arranged from medial to lateral).

The accessory carpal bone acts as the landmark for identifying the surface and topographic anatomy of the ulnar nerve in cattle. Again, the distal row carpals include the fused second and third carpal, and the single fourth carpal.

There are large and small metacarpals in the cattle, which are located immediately distal to the carpals. The third and fourth metacarpals fuse to form the large metacarpal bone in cattle.

The longitudinal / vertical groove on the dorsal surface of the large metacarpal demarcates the embryonic fusion of III and IV metacarpals.

The digits number one to five, depending on the species, but in cattle there are two developed digits III and IV. All these two developed digits of a cattle consist of proximal, middle, and distal phalanges.

These bones form the metacarpal phalangeal joint, proximal interphalangeal joint, and distal interphalangeal joint. In the distal interphalangeal joint of a cattle, the distal sesamoid bones also participate.

There are two distal sesamoids in cattle’s forelimb, one for each digit and located between the middle and distal phalanges. Again, the proximal sesamoid of the cattle’s forelimb is located between the palmar surface of the distal metacarpal and the proximal phalanges.

There are a total of 4 proximal sesamoids for each forelimb of the cattle. Here, Figure 5 shows the key identifying features of radius and ulna, carpals, metacarpals, and phalanges from the cattle’s forelimb.

Conclusion

So, there are 4 main segments / parts of the forelimb in the cattle. The scapula, humerus, radius-ulna, carpals, metacarpals, and phalanges from the pectoral girdle, arm, forearm, and manus, respectively.

Parts of the forelimb in the cattle are essential for further learning of the courses of nerves and vessels. It is also essential for identifying the bones along with their direction from the different parts of the cattle’s forelimb.

References 

• Ghosh, R. K. : Primary veterinary anatomy, 2nd Edn.Current Books International, Kolkata.
• Gabriele et al., Descriptive osteology of the thoracic limb of bovine, Multidiscipilinary scientific journal of O Saber, 2024.
• Casanova et al., Asymmetries of Forelimb Digits of Young Cattle, veterinary science, 2020.
• Siddiqui et al., Macro-anatomy of the bones of the forelimb of Black Bengal goat (Capra hircus), Bangladesh journal of veterinary medicine, 2008.
• Rowen D. Frandson, W. Lee Wilke, and A. Dee: Anatomy and physiology of farm animals, 4^th edn.Wiley-Blackwell, USA.
• Mcleod, W. N.: Bovine anatomy, 2^nd Edn. Burgess publishing co. Minneapolis.
• Getty, R,. Sission and Grossman’s The anatomy of the domestic animals, 5^th Edn. W. B. Saynders and Co. Philadelphia (USA).