Superficial Chest Muscles

Name the 4 Pectoral Muscles of the cat

1-Pectoantebrachialis 2-Pectoralis major 3-Pectoralis minor 4-Xiphihumeralis

Chest or Pectoral Muscles of the cat

Chest or Pectoral Muscles of the cat adduct the arm

Number of Pectoral muscles in Human and Cat

In Humans, there are just 2 pectoral muscles while cats have 4

3-Pectoralis minor "Size difference from Humans"

In cats, Pectoralis Minor is larger than the pectoralis major. In Humans, major is significantly larger than the minor.

3-Pectoralis minor "Location differences from Humans"

In cats, part of this muscle lies beneath the pectoralis major, while part of it is superficial. In humans, the entire pectoralis minor lies beneath the pectoralis major.

2-Pectoralis major "Shape and Size"

It is 2 to 3 inches wide and its fibres run approximately at right angles to the midline of the Cat's Body

1-Pectoantebrachialis "shape and size"

It is thin, strap like muscle that is about 1/2 inch wide

1-Pectoantebrachialis "Origin and Insertion"

It originates on the manubrium of the sternum and inserts on the fascia of the forelimb, near the elbow.

At its lateral edge, from which muscle you will have to separate the pectoralis minor?

Latissimus dorsi.

1-Pectoantebrachialis "Homologue in man"

No homologue in man

4 Pectoral Muscles of the cat "Difficult to separate", Solution?

To find boundaries b/w adjacent muscles, look for changes in muscle fiber orientation and subtle, thin white lines of connective tissue.

3-Pectoralis minor "Origin And Insertion"

originate on the Sternum and insert on the proximal half of the humerous.

2-Pectoralis major "Origin and Insertion"

the fibres of this muscle originate on the Sternum and inserts on the proximal two-thirds of the humerous, between the biceps and brachialis

1-Pectoantebrachialis "Description"

the most superficial of the chest muscles

3-Pectoralis minor "Shape and Size"

thick and fan shaped, lies posterior to the Pectoralis major, the fibres of Pectoralis minor run at an oblique angle to the midline of the body

4-Xiphihumeralis "Description"

this is the posterior-most chest muscle and is absent in humans. It runs from the xiphoid process of the sternum to the humerous.