A&P II Forearm and Hand MG 3
Terms
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- the __ eminence is located at the thumb's base, while the __ eminence is located along the ulnar side of the palm.
- thenar, hypothenar
- how many muscles act upon the thumb __
- eight
- How many of these are located at the thenar eminence?
- four
- what muscle is responsible for creating opposition of the thumb?
- opponens pollicis
- the distal tendons of which three muscles form the "anatomical snuffbox"?
- abductor pollicis, extensor pollicis longus and brevis
- The palmar interossei are difficult to access because they are deep to the __ muscles and situated between the __ bones
- lombricals, metacarpals
- the lumbricals sprouts from the sides of the tendons of which muscle?
- flexor digitorum profundus
- which muscle is located between the pisiform and the base of the fifth finger?
- abductor digiti minimi
- Action of Opponens Pollicis
- opposition of the thumb ad the carpometacarpal joint
- Origin of Opponens Pollicis
- flexor retinaculum and tubercule of the trapezium
- Insertion of Opponens Pollicis
- entire length of first metacarpal bone, radial side
- Action of Adductor Pollicis
- adduct the thumb; assist in flexion of the thumb
- Origin of Adductor Pollicis
- capitate, second and third metacarpals
- Insertion of Adductor Pollicis
- base of proximal phlange of the thumb
- Action of Abductor Pollicis Brevis
- Abduct the thumb; assist in opposition of the thumb
- Origin of Abductor Pollicis Brevis
- flexor retinaculum, trapezium and scaphoid tubercles
- Insertion of Abductor Pollicis Brevis
- base of proximal phlalange of thumb
- Action of Flexor Pollicis Brevis
- flex the thumb, assist in opposition of the thumb
- Origin of Flexor Pollicis Brevis
- Superficial Head: Flexor retinaculum; Deep Head: trapezium, trapezoid and capitate
- Insertion of Flexor Pollicis Brevis
- base of proximal phalange of thumb
- Action of Abductor Pollicis Longus
- abduct the thumb; extend the thumb
- Origin of Abductor Pollicis Longus
- posterior surface of radius and ulna, and interosseous membrane
- Insertion of Abductor Pollicis Longus
- base of the first metacarpal
- Action of Extensor Pollicis Longus
- extend the thumb; assist to extend the thumb
- Origin of Extensor Pollicis Longus
- posterior surface of ulna and interosseous membrane
- Insertion of Extensor Pollicis Longus
- distal phalange of the thumb
- Action of Extensor Pollicis Brevis
- extend the thumb; assist to extend the thumb
- Origin of Extensor Pollicis Brevis
- posterior surface of radius and interosseous membrane
- Insertion of Extensor Pollicis Brevis
- proximal phalange of the thumb
- Action of Flexor Pollicis Longus
- flex the thumb; assist to flex the thumb
- Origin of Flexor Pollicis Longus
- anterior surface of radius and interosseous membrane
- Insertion of Flexor Pollicis Longus
- distal phalange of the thumb
- Action of lumbricals of the hand
- extend the second through fifth fingers at the interphalangeal joints; flex the second through fifth fingers at the metacarpophalangeal joints
- Origin of lumbricals of the hand
- surfaces of the flexor digitorum profundus tendons
- Insertion of lumbricals of the hand
- extensor aponeurosis on dorsal surface of phalanges
- Action of palmar interossei
- adduct the thumb, second, forth and fifth fingers woard the third finger; assist in flexion of the thumb, second fourth ad fifth fingers at the metacarpophalangeal joionts; assist in extension of the thumb second forth and fifth fingers at the interphalangeal joints
- Origin of palmar interossei
- base of the first second fourth and fifth metacarpals
- Insertion of palmar interossei
- base of the proximal phalange of the related finfer and the extensor aponeurosis Edit