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23 Cards in this Set

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Deltoideus m.
Two heads -
Pars scapularis
Pars acromialis
Deltoideus - pars scapularis m.
Origin - spine of scapula by an aponeurosis

Insertion - deltoid tuberosity of humerus

Innervation - axillary n.

Main action - flex shoulder joint
Deltoideus - pars acromialis m.
Origin - acromion of scapula

Insertion - deltoid tuberosity of humerus

Innervation - axillary n.

Main action - flex shoulder joint
Infraspinatus m.
Origin - infraspinous fossa of scapula

Insertion - lateral side of greater tubercle of humerus

Innervation - suprascapular n.

Main actions - extend or flex, **laterally stabilize**, and abduct shoulder joint
Subtendinous synovial bursa
The subtendinous synovial bursa is located deep to the tendon of insertion of the infraspinatus m. where it courses over the caudal part of the greater tubercle of the humerus before inserting distal to the tubercle.
Teres minor m.
Origin - infraglenoid tubercle and distal 1/3 of caudal border of scapula

Insertion - teres minor tuberosity of humerus

Innervation - axillary n.

Main actions - flex shoulder joint, rotate shoulder laterally, prevent medial rotation when bearing weight
Supraspinatus m.
The m. supraspinatus is a thick muscle that fills the supraspinous fossa and covers the cranial margin of the scapula.

Origin - supraspinous fossa of scapula

Insertion - greater tubercle of humerus

Innervation - suprascapular n.

Main actions - extend and laterally stabilize shoulder joint
Subscapularis m.
Origin - subscapular fossa of humerus

Insertion - lesser tubercle of humerus

Innervations - subscapular n., **axillary n. (small area, caudal portion of the muscle)**

Main actions - adduct, extend, and **medially stabilize shoulder joint**; rotate the shoulder medially and prevent lateral rotation when bearing weight
Teres major m.
Origin - caudal angle and caudal border of scapula, caudal surface of subscapularis m.

Insertion - teres major tuberosity of humerus

Innervation - axillary n.

Main actions - flex shoulder joint, rotate shoulder medially
Coracobrachialis m.
Origin - coracoid process of scapula

Insertion - crest of lesser tubercle of humerus, proximal to teres major tuberosity

Innervation - musculocutanous n.

Main actions - adduct, extend, and stabilize shoulder joint
Tensor fasciae antebrachii m.
In the cat, the tensor fasciae antebrachii m. is wider, covers more of the medial surface of triceps brachii m., and is called epitroclearis m.

Origin - fascia covering lateral sides of latissimus dorsi m.

Insertion - olecranon

Innervation - radial n.

Main action - extend elbow
Triceps brachii mm.
In the dog and cat, the m. triceps brachii has four heads.These insert in common via a stout tendon on the point of the elbow, formed by the olecranon of the ulna. There is a synovial bursa between the tendon of the long head and the cranial part of the olecranon.

Heads -
Long head
Medial head
Accessory head
Lateral head
Triceps brachii - caput longum m.
Origin - caudal border of scapula

Insertion - olecranon

Innervation - radial n.

Main action - flex shoulder joint and extend elbow
Triceps brachii - caput mediale m.
Origin - crest of lesser tubercle of humerus near teres major tuberosity

Insertion - olecranon

Innervation - radial n.

Main action - extend elbow
Triceps brachii - accessory head m.
Origin - neck of humerus

Insertion - olecranon

Innervation - radial n.

Main action - extend elbow
Triceps brachii - caput laterale m.
Origin - tricipital line of humerus

Insertion - olecranon

Innervation - radial n.

Main action - extend elbow
Anconeus m.
Origin - lateral supracondylar crest, medial and lateral humeral epicondyles

Insertion - lateral surface of the proximal end of ulna (olecranon)

Innervation - radial n.

Main action - extend elbow
Epitrochleoanconeus m.
Present in the cat, but not in the dog.

Part of anconeus m.

Associated with the supracondylar foramen medially.
Biceps brachii
Origin - supraglenoid tubercle of scapula

Insertion -
Dog - radial and ulnar tuberosities
Cat - radial tuberosity

Innervation - musculocutaneous n.

Main actions - extend shoulder joint and flex elbow
Transverse humeral retinaculum
The transverse humeral retinaculum is a ligament that bridges the intertubecular groove of the humerus, covering the tendon of origin of the m. biceps brachii.
Intertubercular (bicipital) bursa
An **extension of the shoulder joint capsule** that wraps around the biceps brachii tendon and acts as a synovial sheath.

Decreases friction on the tendon as it corses through the intertubecular groove.

Technically, this is a synovial sheath, but we call it a bursa.
Brachialis m.
Remember brachiaLis has an 'L' so it is on the lateral side.

Origin - proximal 1/3 of lateral surface of humerus

Insertion -
Dog - radial and ulnar tuberosities
Cat - radial tuberosity

Innervation - musculocutaneous n.

Main action - flex elbow
Brachial mm.
Parts -
Biceps brachii
Brachialis
Coracobrachialis
Triceps brachii
Anconeus
Tensor fasciae antibrachii