Lecture 11: Brachium And Elbow Flashcards
What muscles extend the arm
Supraspinatus
Triceps brachii (long head)
Brachiocephalicus
What muscles flex the arm (delta takes little planes)
- deltoideus
- teres major
- teres minor
- latissimus dorsi
- pectoralis profundus
What muscle abduct the arm
Infraspinatus
What muscles adduct the arm
- pectoral muscles
- subscapularis
- coracobrachialis
What are the 3 joints of the elbow
Radio-humeral joint
Ulno-humeral joint
Proximal radio-ulnar joint
What ligaments support the elbow
Lateral collateral
Medial collateral
Annular ligament of radius
Oblique ligament
What ligament of the elbow prevents over-extension of the elbow
Oblique ligament
What ligaments of the elbow prevent excessive abduction and adduction of the radius and ulna relative to the humerus
Collateral ligaments
What joints of the elbow permit the flexion/extension along a sagittal plane
Radio-humeral joint
Ulno-humeral joint
What ligament of the elbow allows for pronation/supination of the distal radius
Annular ligament of the radius
What are the flexor muscles of the arm that act at the elbow
Biceps brachii
Brachialis
What artery supplies the flexor compartment muscles of the arm
Brachial artery
What nerve innervates the flexor muscles of the arm
Musculocutaneous
What are the extensor muscles of the arm that act on the elbow
triceps brachii
tensor fascia antebrachi
anconeus
What artery supplies the extensor muscles of the arm
Deep brachial artery
What nerve innervates the extensor muscles of the arm
Radial nerve
Origin of the long head of triceps brachii (1)
Infaglenoid tubercle and caudal edge of scapula
Origin of the lateral head of Cicero’s brachii (2)
B/w the tuberosity for the teres minor and the deltoid tuberosity
Origin of the medial head of the triceps brachii (3)
On the crest of the minor tubercle b/w the point of insertion of the teres major and that of the coracobrachialis
Origin of the accessory head of the triceps brachii (4)
From the proximal caudal part of the neck to the humerus
What is the insertion point of the triceps brachii
Olecranon process of the ulna
What happens when there is an avulsion fracture of the olecranon
Loss of triceps brachii attachment
Loss of elbow extension
- inability to support weight of the limb
What is the origin and insertion of the brachialis
O: caudal aspect of the proximal humerus
I: ulnar tuberosity b/w 2 deep insertion of biceps brachi
Origin of the biceps brachii
O: supraglenoid tubercle
What are the deep insertions of the biceps brachii
On the radial tuberosity and medial ulna
What is the superficial insertion of the biceps brachii
Antebrachial fascia via bicipital aponévroses (lateral fibrosis)
In horses, a fibrous band, the _______ joins the tendons of origin and insertion of the biceps brachii
The internal tendon
The ____ tendon enables the muscle to store energy when stretched during the support phase of stride
Central
The brachial plexus is protected by muscles of the arm, particularly the _________ and _______
Pectoral muscles and serratus ventralis
What is the origin of the radial nerve
C7-T1
What muscles are innervated by the radial nerve
Triceps brachii, anconeus, tensor fasciae antebrachii
What is the origin of the musculocutaneous nerve
C7-C8
What muscles are innervated by the musculocutaneous nerve
Coracobrachialis
Biceps brachii
Brachialis
What is the origin of the medial and ulnar nerves
C8-T1
What muscles does the median nerve innervated
Most of the flexor muscles of the carpus and digits
What muscles does the ulnar nerve innervate
Most of the flexor muscles of the carpus and digit
What is #1
Humeral shaft
What is #2
Medial epicondyle
What is #3
Lateral epicondyle
What is #4
Trochlea of humerus
What is #5
Capitulum of humerus
What is #6
Olecranon (ulna)
What is #7
Olecranon process (tuber)
What is #8
Medial coronoid process of ulna
What is #9
Head of radius
Which neurovascular structures are potentially endangered by a fracture of the humeral shaft
