Lecture 15: Upper limb 4- Forearm flexor aspect and wrist

Question 1

What is the function of the quadrate ligament?

Answer 1

to prevent supination and pronation of the elbow

Question 2

what does the the interossesous membrane do?

Answer 2

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.

Question 3

What are the pivot points that allow the radius to rotate medially around the ulna (i.e. pronation) and laterally (i.e. supination).

Answer 3

Proximal and distal ends of the radio-ulna joints

Question 4

What are the three rotatory muscles of the radius?

Answer 4

pronator teres
pronator quaratus
supinator muscle

Question 5

Where does the interrosseous memebrane attach to?

Answer 5

medial side of radius and lateral side of ulna

Question 6

what distal ends of the ulna are covered by fibrous articular cartilage?

Answer 6

head of ulna and the ulnar styloid process

Question 7

what distal ends of the radius are covered by articular cartilage?

Answer 7

ulna notch, radial styloid process, and the fibrous articular disc

Question 8

the fibrous articular disc seperates the _____ from the _____.

Answer 8

wrist joint proper; radius and ulna.

Question 9

What are the three attachment points for the radius and ulna ?

Answer 9

1) annular ligament
2) triangular fibrocartilage complex (TFFC, which is basically the fribrocartilage disc)
3) interrosseous membrane

Question 10

On the mid forearm, the lateral intermuscular septa blends in with the _____

Answer 10

anterbrachial facscia and the periosteum of the radius

Question 11

On the mid forearm, the _______ acts like the medial intermuscular septa

Answer 11

posterior boarder

Question 12

What muscle forms the first part of the posterior surface of the forearm?

Answer 12

brachioradialis

Question 13

what muscle forms the first part of the most lateral anterior surface of forearm?

Answer 13

pronator teres

Question 14

The muscle that is posterior to the ulna in the posterior surface is ______

Answer 14

extensor carpi ulnaris

Question 15

The muscle that is medial to the ulna in the anterior surface is ______

Answer 15

flexor carpi ulnaris

Question 16

what are the anterior (flexor) muscles of the forearm?

4 superficial, 1 intermediate, and 3 deep

Answer 16

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)

Question 17

what are the posterior surface muscles of the forearm?

Answer 17

1) brachioradialis
2) extensor carpii ulnaris
3) extensor digitorus

Question 18

What bones make up the carpals (wrist)?

some lovers try positions that they can’t handle

Answer 18

scaphoid 
lunate
triquetrum
pisiform
trapezium
trapezoid
capitate
hamate

Question 19

What bones make up the metacarpals?

Answer 19

I, II, III, IV, V

Question 20

What makes up a digit bone?

Answer 20

metacarpalphalangeal joint
proximal phalanx
proximal interphalangeal joint
middle phalanx
distal interphalangeal joint
distal phalanx

Question 21

What are the three joints of the wrist?

Answer 21

1) radiocarpal joint
2) midcarpal joint
3) carpometacarpal joint

Question 22

The radiocarpal joint can perform…

Answer 22

the most flexion and extension out of the 3 wrtist joints.

Question 23

The carpometacarpal joint doesnt move EXCEPT ____

Answer 23

the thumb!

Question 24

the extensor retinaculum is more on the ___

Answer 24

posterior end of the wrist

Question 25

The flexor retinaculum is more on the (a) and forms (b)

Answer 25

(a) anterior side of the wrist bones, between the pisiform and hook of hamate medially and scaphoid and trapezium laterally.
(b) carpal tunnel

Question 26

why is the flexor retinaculum thicker?

Answer 26

it houses more tendons

Question 27

What is the origin of the muscles of the anterior compartment

Answer 27

Origin: common flexor tendon that is attached to the anterior aspect of the medial epicondyl of humerus

Question 28

What is the insertion of the flexor carpi radialis?

Answer 28

2nd metacarpal

Question 29

What is the insertion of the flexor carpi ulnaris?

Answer 29

pisiform bone, which is attached to the base of the 5th metacarpal

Question 30

What muscle helps the FCR and FCU to flex the wrist?

Answer 30

palmaris longus

Question 31

the tendons of the FDS FDP and FPL pass under the…

Answer 31

flexor retinaculum through a synovial sheath of the palm.

Question 32

the pronator quandratus inserts into the

Answer 32

lower end of the radius

Question 33

what does the pronator quandratus do?

Answer 33

pulls the ulna in pronatory movement

Question 34

What is the palmer aponeurosis

Answer 34

a fibrous sheet that connects the tendon of the palmaris longus and extend it to the 4 digits.

Question 35

Palmaris longus attaches ___ the flexor retinaculum, while the FCR attaches ____.

Answer 35

over; under