2.7 Arm, Forearm, and Hand Flashcards
What is the action of the biceps brachii m?
supinates and flexes forearm, flexes arm
What is the proximal attachment of the short head of the biceps brachii m?
coracoid process of scapula
What is the proximal attachment of the long head of the biceps brachii m?
supraglenoid tubercle of scapula
What is the distal attachment of the biceps brachii m?
radial tuberosity
What is the action of the brachialis m?
flexes forearm
What is the proximal attachment of the brachialis m?
humerus
What is the distal attachment of the brachialis m?
ulnar tuberosity
What is the action of the coracobrachialis m?
flexes arm
What is the proximal attachment of the coracobrachialis m?
coracoid process of scapula
What is the distal attachment of the coracobrachialis m?
humerus
What is the innervation of the triceps brachii m?
radial n
What is the action of the triceps brachii m?
extends forearm and arm
What is the proximal attachment of the long head of the triceps brachii m?
infraglenoid tuberose of scapula
What is the proximal attachment of the lateral head of the triceps brachii m?
humerus superior to the radial groove
What is the proximal attachment of the medial head of the triceps brachii m?
inferior to the radial groove of the humerus
What is the distal attachment of the triceps brachii m?
olecranon of ulna
The medial brachial and antebrahcial cutaneous nn. provide sensory innervation of the skin of the medial side of the arm and forearm, and arise from where?
medial cord (C8-T1)
The lateral brachial cutaneous n. innervates skin of the lateral side of the arm, and arises from where?
axillary n. (C5-C6)
What is the common proximal attachment of the muscles of the anterior forearm?
medial humeral epicondyle (common flexor origin)
What is the common innervation of the muscles of the anterior forearm?
Median n. with minor contributions from the ulnar n.
What is the common action of the muscles of the anterior forearm?
flexion of elbow, wrist, and hand, also pronate forearm
What is the common proximal attachment of the muscles of the posterior forearm?
lateral humeral epicondyle (common extensor tendon)
What is the common innervation of the muscles of the posterior forearm?
radial n.
What is the common action of the muscles of the posterior forearm?
extension of joints of the elbow, wrist, and hand, also supinate forearm
What muscle of the posterior compartment of the forearm is the exception, as it passes ant. to the elbow and thus acts as a flexor?
brachioradialis
The lateral antebrachial cutaneous n. innervates skin of the lateral side of the forearm, and arises from where?
musculocutaneous n. (C5-C7)
What passes over the anatomical snuff box and provides cutaneous innervation to the lateral aspect of the hand and dorsum of proximal parts of lateral 3.5 digits?
superficial branch of the radial n.
What innervates the thenar muscles?
recurrent motor branch of median n.
What innervates the hypothenar muscles?
deep branch of the ulnar n.
The midpalmar space is continuous with the anterior forearm via the …
carpal tunnel
The carpal tunnel contains…
tendons of flexors and median n.
What passes superficial to the carpal tunnel allowing sensation to the palm to remain intact if swelling occurs?
palmar cutaneous branch of median n.
The radial a. anastomoses with … to form the deep palmar arch (on metacarpals)
deep branch of ulnar artery
The ulnar a. continues as … in the hand.
superficial palmar arch
The ulnar a. enters the hand via Guyon’s canal, lying … to the ulnar n.
lateral
What provides sensory innervation to the skin on the lateral palm and palmar surface of the lateral 3.5 digits, along with the dorsal distal half
superficial branch of the median n.
