Gross Anatomy I Lecture - Arm muscles

what is the origin of the short head of the biceps brachii?

coracoid process/scapula

what is the origin of the long head of the briceps brachii?

supraglenoid tubercle/scapula

what are the insertions of the biceps brachii?

1. tuberosity/radius

2. shaft/ulna

what actions does the biceps brachii as a whole carry out?

1. flexion of the forearm at the elbow joint

2. supinates the forearm at the proximal radio-ulna joint

what specific action does the short head of the biceps brachii carry out?

adducts the humerus

what specific action does the long head of the bicpes brachii carry out?

abducts the humerus

what is the innervation of the biceps brachii?

musculocutaneous nerve

what is the origin of the coracobrachialis?

coracoid process/scapula

what is the insertion of the coracobrachialis?

shaft/humerus

what actions does the coracobrachialis carry out?

1. flexion of the humerus

2. weak adduction of the humerus

3. helps stabilize the shoulder joint

what is the innervation of the coracobrachialis?

musculocutaneous nerve

what is the origin of the brachialis?

shaft/humerus

what are the insertions of the brachialis?

1. coronoid process/ulna

tuberosity/ulna

what actions does the brachilis carry out?

flexion of the forearm at the elbow joint

what is the innervation of the brachialis?

musculocutaneous nerve

what is the origin of the long head of the triceps brachii?

infraglenoid tubercle/scapula

what is the origin of the lateral and medial head of the triceps brachii?

shaft/humerus

what is the insertion of the triceps brachii?

olecranon process/ulna

what action does the triceps brachii carry out?

extension of the forearm at the elbow joint

what is the innervation of the triceps brachii?

radial nerve

what is the origin of the anconeus?

lateral epicondyle/humerus

what are the insertions of the anconeus?

1. olecranon process/ulna

2. proximal posterior shaft/ulna

what action does the anconeus carry out?

assists weakly in extension of the forearm at the elbow joint

what is the innervation of the anconeus?

radial nerve