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what serves as major muscle attachments?
what accommodates ulnar olecranon in extension?
radius and ulnar are held together by:
- interosseous membrane
- which "reduces translation btwn the 2 bones" & are also held together by proximal & distal radioulnar joint
what inserts on the coronoid process?
- brachialis tendon
- occasionally the flexor pollicus longus
tricep tendon attaches to:
attachment of the brachialis tendon:
head of radius articulates on:
the end of the head of the radius articulates with the:
the rounded part of the head articulates c/:
- ulna & partly c/ the ligaments that surround it
what attaches the distal radioulnar joint to the radius and ulnar styloid?
during movement assoc with supination & pronation of the hand, the _____________ rides around the ___________ with the _______ providing the pivot point.
- distal head of the radius
- head of the ulna
- ulnar styloid
wrist joint is made of what 2 joints?
what are their functions?
- radiocarpal joint: radial & ulnar deviation
- mid carpel joint
both: flexion & extension of the wrist
what are the 8 carpel bones in order?
what are the 3 ligaments of the wrist?
- radial collateral ligament
- anular ligament
- ulnar collateral ligament
which ligaments of the wrist are laterally placed?
what do they do?
- radial collateral ligament
- anular ligament
holds the radial side of the elbow together
what muscle arises from the radial collateral ligament?
radial collateral ligament attaches from the:
lateral epicondyle & "fans out" continuous c/ the anular ligament
anular ligament conforms entirely to the:
radial head so that the radius, although ALLOWED to rotate, is completely limited otherwise
the ulnar collateral ligament arises from:
the medial epicondyle "fanning out" in a triangle attaching to the ulna all along the medial side of the trochlear notch
is the joint capsule of the elbow stable or not stable?
- VERY STABLE
- (ligaments & bony articulation)
what joints are referred to as 1 joint (elbow joint) bc they are located in the same anatomical region & not entirely separated structurally?
- Humeral ulnar joint
- proximal radioulnar joint
what 2 joints are close together but are physically separated?
- distal radioulnar joint
- wrist joint
describe the appearance of the elbow joint:
- relatively loose, thin, & baggy ant & post
- this allows FROM
what is a difference btwn the elbow joint and the wrist joint?
- elbow stability is related to osseous structures
- wrist is stabilized & held together ENTIRELY by ligaments
the capsule of the wrist joint is strong & represented on the extensor aspect as the _________ & on the flexor aspect, it forms the:
- Dorsal radiocarpal ligament
- Palmar radiocarpal ligament
collateral ligaments hold bones together in:
radial & ulnar deviation
radiocarpal ligaments hold bones together in:
flexion & extension
3 flexor muscles of the forearm:
*note: all of these muscles funct: is flex the forearm. and a little supination
- biceps brachii
attachment of brachialis:
arising from broad area on the ant humerus & is inserted onto ulnar tuberosity
attachment of bicep brachii-
on its lateral edge, the tendon fans out medially into a thin sheet of fascia called ________ which is continuous c/ deep fascia that surrounds the forearm
- long: travels thru bicipital groove to supraglenoid process
- short: arises from coracoid process
- they merge distally forming "2 part tendon"
- inserts on radial tuberosity
- Bicipital aponeurosis
attachment of the brachioradialis:
arises half way up the humerus to insert on the distal radius
the extensor of the forearm:
attachments of the 3 heads of the triceps:
- long: infraglenoid tubercle
- lateral: high up on the lateral side of the posterior humerus
- medial: a broad area lower down & more medially
what are the forearm rotators:
the pronators & supinators
- pronator teres
- pronator quadratus
- bicep brachii (as a supinator)
attachment of the pronator teres:
- medial epicondyle & ulnar
- inserts 1/2 way down on the lateral surface of the radius
what nerve passes thru btwn 2 heads of the pronator teres?
attachment of the pronator quadratus:
- arises from anteriomedial aspect of the ulna
- inserts on anterior surface of the radius
attachment of the supinator:
- arises from lateral epicondyle & radiocollateral ligament, anular ligament, & supinator crest of the ulna
- inserts on radius on a line just above pronator teres
what nerve runs thru the supinator muscle?
a deep branch of the radial nerve
what muscle is a direct antagonist of the supinator muscle?
attachment of the bicep brachii: