Hand Muscles, Movement And Function Flashcards
Name the muscles of the thenar eminence
Flexor pollicis brevis
Abductor pollicis brevis
Opponents Pollicis
Adductor pollicis
Which is the most medial of the thenar muscles?
Flexor Pollicis Brevis
What are the origins of Flexor Pollicis Brevis?
Flexor retinaculum
Tubercle of trapezium
Where does Flexor Pollicis Brevis insert?
Radial side of the base of the proximal phalanx of thumb
What is the nerve supply of Flexor Pollicis Brevis?
Median T1
What are the actions of Flexor Pollicis Brevis?
Flexion MCP, CMC, medial rotation of thumb
Which is the most lateral and superficial of the thenar muscles?
Abductor Pollicis Brevis
What are the origins of Abductor Pollicis Brevis?
Flexor retinaculum
Tubercles of scaphoid and trapezium
Where are the insertions of Abductor Pollicis Brevis?
Radial side of the base of the proximal phalanx of the thumb
Extensor hood of the thumb
What is the nerve supply of Abductor Pollicis brevis?
Median T1
What action does Abductor Pollicis brevis produce?
Abduction of the CMC/MCP joints of the thumb
Where does Opponens Pollicis originate?
Flexor retinaculum
Tubercle of trapezium
Where does Opponens Pollicis insert?
Whole length anterior-lateral surface of first metacarpal
What is the nerve supply of Opponens Pollicis?
Median T1
What action does Opponens Pollicis produce?
Opposition
Which thenar muscle is found in the web space of the thumb?
Adductor Pollicis
Where does adductor Pollicis originate?
Capitate
Base of metacarpal 2 and 3
Anterior surface shaft of the third metacarpal
Where does adductor Pollicis insert?
Medial side base proximal phalanx of the thumb
Extensor hood of the thumb
What is the nerve supply of adductor Pollicis?
Ulnar nerve C8, T1
What action does adductor Pollicis produce?
Adduction of the thumb
Which muscles are in the hypothenar eminence?
Abductor Digiti Minimi
Flexor Digiti Minimi
Opponens Digiti Minimi
Palmaris brevis
Which is the most superficial hypothenar muscle?
Abductor Digit Minimi
Where does Adductor Digiti Minimi originate?
Pisiform
Pisohammate ligament
FCU tendon
Where does Abductor Digiti Minimi insert?
Ulnar side proximal phalanx of little finger
Extensor hood
What actions are produces by Abductor Digiti Minimi?
Abduction 5th MCP
Flexion 5th MCP
What is the nerve supply of Abductor Digit Minimi?
Ulnar T1
Where does Flexor Digiti Minimi originate?
Hook of Hamate
Flexor retinaculum
Where does Flexor Digiti Minimi insert?
Ulnar side base proximal phalanx little finger
What action does Flexor Digiti Minimi produce?
Flexes 5th MCP
What is the nerve supply of Flexor Digiti Minimi?
Ulnar nerve T1
Where does Opponens Digiti Minimi originate?
Hook of Hamate
Flexor retinaculum
Where does Opponens Digiti Minimi insert?
Antero-medial aspect of shaft of 5th MC
What is the action of Opponens Digiti Minimi?
Opposition 5th digit
What is the nerve supply of Opponens Digiti Minimi?
Ulnar T1
Where does Palmaris Brevis originate?
Flexor retinaculum
Palmar aponeurosis
Where does Palmaris brevis insert?
Skin of palm into dermis
What action is produced by palmaris Brevis?
Steadies and corrugates skin of palm to help with grip
What is the nerve supply of Palmaris Brevis?
Ulnar nerve C8,T1
What action do dorsal interossei muscles produce?
Abduction of fingers 2,3,4
What is the nerve supply for all the dorsal interossei muscles?
Ulnar nerve C8 and T1
What action do palmar interossei produce?
Adduction of digits 1,2,4,5
What is the nerve supply of all the palmar interossei muscles?
Ulna nerve C8 and T1
What do the interossei muscles contribute to via the extensor hood?
Extension of the IP joints
Flexion of the MCP joints
Prevention of hyper extension of the MCP
Important in pretension activities
What do lumbricals attach into?
Extensor hood
What actions are produced by the lumbricals?
Strong extensors of the IP joints
Weak flexors of the MCP joints
Important in pretension activities
What are the 4 Palamar arches?
Proximal transverse arch
Distal transverse arch
Longitudinal arch
Oblique arch
