UE: muscular components Flashcards
describe the muscle compartment for the arm
anterior compartment: flex elbow, flex arm, forearm supination posterior compartment: extend elbow
describe the muscle compartment for the forearm
anterior compartments: flex wrist and fingers, pronation posterior compartment: extend wrist and fingers, supination
describe the muscle compartment for the hand
extrinsic muscles (do not originate in the hand) intrinsic muscles (originate in the hand)
muscles of anterior arm
Coracobrachialis, brachialis, bicep brachii all innervated by the musculocutaneous nerve
coracobrachialis
coracoid process of the scapula to humerus action: flexor of the arm (shoulder) innervated by the musculocutaneous nerve
brachialis
anterior humerus to ulna
action: flexor of forearm (elbow)
* inserts onton the ulna.. ulna has attachment to the humerus….can do hinge actions and flexion and extension but can NOT pivot*
innervation: musculocutaneous nerve
biceps brachii
has two heads (origins) originating from the scapula and attaches to the radial tuberosity
long head tendon passes through intertubercular sulcus
action: flexor and supinator of the forearm
innervation: flexor and supinator of the forearm
* has a lot of actions at the elbow*
triceps brachii
3 heads originating from scapula and humerus and inserting onto olecranon process of ulna
action: extension of forearm (elbow)
innervation: radial nerve
quadrangular space
aother nerve and arteyr that come through it (axillary nerve– deltoid and teres minor)
posterior circumflex (3rd dividsion of axillary artery) above the triangle interval where the radial nerve goes…
arm muscle chart
cubital fossa
- depression anterior to the elbow joint formed by the boarders of :
- brachioradialis muscle
- pronator teres muscle
- epicondyles of humerus
- contents
- tendon of biceps muscle
- median nerve
- brachial artery
- covered by the bicipital aponeurosis
- __median cubital vein travels over the aponeurosis and connects the cephalic and basilic veins
- radial nerve passues under the brachioradialis
- ulna passes posterial to the medial epicondyle
median cubital veins
travels over the aponeurosis and connects the cephalic and basilic veins
r
hand movements … pay attention to this
superficial anterior compartment
superlicial originals near the medial humerius and innervated by the median nerve
…median nerve: travels throug bubital fossa and innervate nerve
innervated by median nerve except fo the flexor carpi ulnaris which is innervated by ulnar nerve
flexor carpi ulnaris
inserts onto the medial carpasl and flexes and adducts the wrist
innervation: ulna nervors
* flexor of the writst on the ulna site and attached to the bones of the wrist on the ulna side*
medial deviation
Palmaris longus
attaches to palmar aponeurosis of hand and flexes wrist (may be absent)
palmar aponeurosis is a triangular deep fascia over the palm, extending to the digits
insets onto the palm, a sheet of the palm….help with cupping the palm
flexor carpi radialis
inserts onto the later metacarpals and thus flexes and abducts wrist
*attach on the radial side….deals with the flexor action of the wristlateral deviation
Pronator teres
attaches to radius and pronates forearm
attaches to the radius and allows pivot action… one of the boundaries of the cubital fossa,
flexor digitotunum
medial humerus and radius to middle phalanges of digits 2-5
flexes digits at metacarpalphalangeal joint and PIP
innervated by median nerve
doesn’t go into distal phalanges so it can’t move it…. moves proximal and metacarpal phalanges joint because it crosses it
muscles of forearm chart
deep muscles of anteriror compartment
deep muscle originate on forearm and interosseous membrane…. all innervated by median never except the flxor digitorum profundus which is innervated by both the median nerve and the ulna nerve
- flexor digitorum profundus
- flexor pollicis longus
- pronator quadratus
flexor digitorum profundus
