Dissection 12 Flashcards
Which muscles are supplied by the axillary nerve?
teres minor; deltoid
what is the proximal attachment of the deltoid muscle?
lateral thrid of the clavicle and the inferior aspects of hte scapular spine and acromion
What is the distal attachment of the deltoid muscle?
deltoid tuberosity of the humerus
Which bursa is found between the supraspinatus tendon adn acromion process of the scapula?
subacromial bursa
What is the sensory innervation to medial posterior arm?
anterior rami of spinal nerves C8, T1 and T2
What is the lateral sensory innervation of the posterior arm?
anterior rami of spinal nerves C5 and C6 via the axillary nerve
What is the muscle of the posterior compartment of the arm?
triceps brachii
What is the innervation to the posterior compartment of the arm?
radial nerve
What is the proximal attachment of triceps brachaii?
infraglenoid tubercle of the scapula (long head); superior (lateral) and inferior (medial) to the radial groove of the humerus
What is the distal attachment of the triceps brachii?
form the triceps tendon which attaches to the olecranon processs of the ulna
What is the action of the triceps brachii?
weak extension of the arm at the shoulder joint and extension of the forearm at the elbow joint
What are hte borders of the quadrangular space that the axillary nerve is foundi n?
superio- teres minor, inferior-teres major, long head of triceps medially, humerus laterally
What is the area of skin innervated by the axiallry nerve called?
the badge patch
What spinal roots make up the radial nerve?
C5-T1
Where is the radial nerve found in the posterior compartment of the arm?
radial groove of the humerus
How does the radial nerve reach the posterior compartment of the forearm?
it leaves the posterior compartment of the arm to enter the lateral aspect of hte cubital fossa before returning to the posterior forearm
What are vulnerable in a mid-shaft fracture of the humerus?
the radial nerve and its accompanying vessels due to their position in the radial groove
What holds the muscles of the posterior compartment of the forearm as they cross the wrist?
extensor retinaculum
Where is the brachioradialis located?
between the anterior and posterior compartments of the forearm
What is the function of brachioradialis?
weak flexion of elbow, esp. when the forearm is semi-pronanted
What is the proximal attachment of the superficial layer of muscles in the posterior forearm?
common extendor tendon on the lateral epicondyle of the humerus
What are the muscles of the superficial layer of the posterior compartment of the forearm?
brachioradialis; extensor carpi radialis; extensor carpi bervis; exntensor digitorum; extensor digit minimi; extensor carpi ulnaris
What is the function of extensor carpi radialis and extensor carpi brevis
extend and awbduct the wrist
What is the function of extensor digitorum and extensor digitorum minimi?
extend the wrist joint and extend the digits (minimi is just the 5th metacarpal)
What is the function of extensor carpi ulnaris?
extends and adducts the wrist
what do the deeper layer of muscles of the posterior compartment of the forearm attach to proximally?
shasfts of the radius and ulna and the interosseous membrane
What is the function of supinator?
supinates forearm at proximal and distal radioulnar joints
What are the muscles of the deep layer of the post. forearm?
supinator; abductor pollicis longus; extensor pollicis longus; extensor pollicis brevis and extensor indicis
Aside from supinator what is the common function of all the deep post. muscles?
extend the wrist
What is the additional function of abductor pollicis longus?
abducts the thumb
What is the additional function of extensor pollicis longus; extensor pollicis brevis?
extends the thumb
What is the additional function of the extensor indicis?
extends the 2nd finger
Where does the radial nerve divide into a superficial and deep branches?
just anterior to the lateral epicondyle
How does the deep branch of the radial nerve reach the supinator muscle?
winds around the neck of the radius
What does the deep branch of the radial nerve become once it passes through supinr
posterior interosseous nerve
