Lecture 15: Upper limb 4- Forearm flexor aspect and wrist Flashcards
What is the function of the quadrate ligament?
to prevent supination and pronation of the elbow
what does the the interossesous membrane do?
1) act as a hinge for the radius to pull across
2) act as muscle attachment
3) force transmission from one bone to the next.
What are the pivot points that allow the radius to rotate medially around the ulna (i.e. pronation) and laterally (i.e. supination).
Proximal and distal ends of the radio-ulna joints
What are the three rotatory muscles of the radius?
pronator teres
pronator quaratus
supinator muscle
Where does the interrosseous memebrane attach to?
medial side of radius and lateral side of ulna
what distal ends of the ulna are covered by fibrous articular cartilage?
head of ulna and the ulnar styloid process
what distal ends of the radius are covered by articular cartilage?
ulna notch, radial styloid process, and the fibrous articular disc
the fibrous articular disc seperates the _____ from the _____.
wrist joint proper; radius and ulna.
What are the three attachment points for the radius and ulna ?
1) annular ligament
2) triangular fibrocartilage complex (TFFC, which is basically the fribrocartilage disc)
3) interrosseous membrane
On the mid forearm, the lateral intermuscular septa blends in with the _____
anterbrachial facscia and the periosteum of the radius
On the mid forearm, the _______ acts like the medial intermuscular septa
posterior boarder
What muscle forms the first part of the posterior surface of the forearm?
brachioradialis
what muscle forms the first part of the most lateral anterior surface of forearm?
pronator teres
The muscle that is posterior to the ulna in the posterior surface is ______
extensor carpi ulnaris
The muscle that is medial to the ulna in the anterior surface is ______
flexor carpi ulnaris
what are the anterior (flexor) muscles of the forearm?
4 superficial, 1 intermediate, and 3 deep
1) pronator teres
2) flexor carpi ulnaris
3) palmaris longus
4) flexor carpi radialis
5) flexor digitorum superficialis
DEEPER MUSCLES
6) flexor digitorum profundus (ulna origin)
7) pronator quadratus (ulna origin)
8) flexor pollicis longus (radial origin)
what are the posterior surface muscles of the forearm?
1) brachioradialis
2) extensor carpii ulnaris
3) extensor digitorus
What bones make up the carpals (wrist)?
some lovers try positions that they can’t handle
scaphoid lunate triquetrum pisiform trapezium trapezoid capitate hamate
What bones make up the metacarpals?
I, II, III, IV, V
What makes up a digit bone?
metacarpalphalangeal joint proximal phalanx proximal interphalangeal joint middle phalanx distal interphalangeal joint distal phalanx
What are the three joints of the wrist?
1) radiocarpal joint
2) midcarpal joint
3) carpometacarpal joint
The radiocarpal joint can perform…
the most flexion and extension out of the 3 wrtist joints.
The carpometacarpal joint doesnt move EXCEPT ____
the thumb!
the extensor retinaculum is more on the ___
posterior end of the wrist
The flexor retinaculum is more on the (a) and forms (b)
(a) anterior side of the wrist bones, between the pisiform and hook of hamate medially and scaphoid and trapezium laterally.
(b) carpal tunnel
why is the flexor retinaculum thicker?
it houses more tendons
What is the origin of the muscles of the anterior compartment
Origin: common flexor tendon that is attached to the anterior aspect of the medial epicondyl of humerus
What is the insertion of the flexor carpi radialis?
2nd metacarpal
What is the insertion of the flexor carpi ulnaris?
pisiform bone, which is attached to the base of the 5th metacarpal
What muscle helps the FCR and FCU to flex the wrist?
palmaris longus
the tendons of the FDS FDP and FPL pass under the…
flexor retinaculum through a synovial sheath of the palm.
the pronator quandratus inserts into the
lower end of the radius
what does the pronator quandratus do?
pulls the ulna in pronatory movement
What is the palmer aponeurosis
a fibrous sheet that connects the tendon of the palmaris longus and extend it to the 4 digits.
Palmaris longus attaches ___ the flexor retinaculum, while the FCR attaches ____.
over; under
