Extrinsic Muscles of the Digits Flashcards
Attachments of flexor digitorum superficialis
O: Humeroulnar head - medial epicondyle of humerus, ulnar collateral ligament and medial part of coronoid process of ulna
Radial head - upper 2/3rd anterior border of radius
I: base of middle phalanx of 2nd - 5th digits
What is the DOF for flexor digitorum superficialis
inferiorly
What is the innervation of flexor digitorum superficialis
median nerve
C7, C8, T1
what is the action of flexor digitorum superficialis
flexion of PIP, MCP and wrist
what is the function of flexor digitorum superficialis
carrying shopping
Attachments of flexor digitorum profundus
O: upper 3/4 anterior and medial surfaces of ulna, middle 1/3rd interosseous membrane and medial part of coronoid process of ulna, posterior border of ulna via aponeruosis
I: base of distal phalanx of 2nd - 5th digits
what is the DOF of flexor digitorum profundus
inferior
deep to FDS
what is the nerve supply to flexor digitorum profundus
medial part: ulnar nerve - C8, T1
lateral part: anterior interosseous branch of median nerve - C8, T1
what is the action of flexor digitorum profundus
flexes DIP, PIP, MCP and wrist
what is the function of flexor digitorum profundus
Writing with a pen
What are the attachments of extensor digitorum?
O: lateral epicondyle of humerus via CEO
I: base of middle and distal phalanx of 2nd-5th digits via DDE
what is the nerve supply of extensor digitorum?
posterior interosseous branch of radial nerve - C7,C8
what is the action of extensor digitiorum?
Extension of the DIP, PIP, MCP and wrist
what is the function of extensor digitorum?
releasing a grip
What are the attachments of extensor indicis?
O: lower part of posterior surface of ulna and adjacent interosseous membrane
I: into the DDE on proximal phalanx of index finger
what is the nerve supply of extensor indicis?
posterior interosseous branch of the radial nerve - C7, C8
what is the DOF of extensor indicis?
tendon runs medially to extensor digitorum
inferolaterally
what is the action of extensor indicis?
aids extensor digitorum to extend the DIP, PIP and MCP of the index finger - enabling independent extension
what is the function of extensor indicis?
pointing
what is the function of extensor indicis?
pointing at object
what are the attachments of extensor digiti minimi?
O: lateral epicondyle of humerus via CEO
I: DDE on base of middle phalanx of little finger
what is the nerve supply of extensor digiti miimi?
posterior interosseous branch of radial nerve - C7, C8
what is the DOF of extensor digiti minimi?
inferomedially
What is the action of extensor digiti minimi?
assists extensor digitorum to extend MCP and PIP of little finger
abduction of little finger
extension of the wrist
