Intrinsic Muscles of the Hand Flashcards
What is the Origin of the Opponens Pollicis?
Flexor Retinaculum and tubercles Scaphoid, and Trapezium
What are the Thenar Muscles of the hand?
Oppenens Pollicis, Abductor Pollicis Brevis, Flexor Pollicis Brevis, Adductor Pollicis,
What is the Insertion of the Opponens Pollicis?
Lateral Side of 1st Metacarpal
What innervates with opponens pollicis?
Recurrent Branch of median nerve (C8, T1)
What is the Action of the Opponens Pollicis?
To oppose thumb, it draws 1st metacarpal medially to center of palm and rotates it medially
What is the Origin of the Abductor Pollicis Brevis?
Flexor Retinaculum and tubercles of the Scaphoid and Trapezium
What is the Insertion of the Abductor Pollcis Brevis?
lateral side of base of proximal phalanx of thumb
What is the innervation of the Abductor Pollicis Brevis
Recurrent Branch of Median Nerve (C8,T1)
What is the action of the Abductor pollicis Brevis?
Abducts Thumb; helps oppose it
What is the Origin of the Flexor Pollicis Brevis
Flexor Retinaculum and Tubercles of Scaphoid and Trapezium
What is the Insertion of Flexor Pollicis Brevis?
Lateral side of base of proximal phalanx of thumb
What is the Innervation of the Flexor Pollicis Brevis?
Recurrent Branch of the Median Nerve (C8, T1) C8 Main Segmental
What is the Action of the Flexor Pollicis Brevis
Flexes thumb
What is the Origin to Adductor Pollicis
Oblique Head: bases of 2nd and 3rd metacarpal, capitate, and other adjacent carapals
Transverse Head: Anterior surface of the shaft of 3rd Metacarpal
What is the Insertion of the Adductor Pollicis
Medial side of base of proximal phalanx of thumb
What is the innervation of the Adductor Pollicis
Deep branch of Ulnar Nerve C8,T1
What is the action of the adductor pollicis
Adducts thumb toward lateral border of palm
What are the Hypothenar Muscles?
Abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi
What is the origin of the abductor digiti minimi
Pisiform
What is the insertion of the abductor digiti minimi
Medial side of base of proximal phalanx of 5th finger
What is the innervation of the abductor digiti minimi?
Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1
What is the action of the abductor digiti minimi
abducts 5th finger; assists in flexion of its proximal phalanx
What is the origin of the flexor digiti minimi brevis
Hook of Hamate and Flexor Retinaculum
What is the insertion of the flexor digiti minimi brevis
Medial side of base of the proximal phalanx of 5th finger
What is the innervation of the flexor digiti minimi brevis?
Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1
What is the action of the flexor digiti minimi brevis?
flexes proximal phalanx of 5th finger
What is the origin of the opponens digiti minimi
Hook of Hamate and Flexor Retinaculum
What is the insertion of the Opponens Digiti Minimi
Medial border of the 5th metacarpal
What is the innervation of the Opponens Digiti Minimi?
Deep Branch of Ulnar Nerve (C8,T1) main segmental at T1
What is the action of the Opponens Digiti Minimi?
Draws 5th metacarpal anterior and rotates it, bringing 5th finger into opposition with thumb
What are the Short Muscles?
Lumbricals (1 and 2, 3 and 4), Dorsal Interossei 1-4, Palmar Interossei 1-3
What is the origin of the Lumbricals, 1 and 2?
lateral two tendons of flexor digitorum profundus (as unipennate muscles)
What is the insertion of Lumbricals, 1 and 2
lateral sides of extensor expansions of the 2nd and 5th fingers
What is the innervation of the Lumbricals, 1 and 2
Median Nerve (C8, T1) main segmental at T1
What is the action of Lumbricals, 1 and 2
Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd- 5th fingers
What is the origin of the Lumbricals, 3 and 4
Medial three tendons of flexor digitorum profundus (as bipennate muscles)
What is the insertion of Lumbricals, 3 and 4
lateral sides of extensor expansions of 2nd-5th fingers
What is the innervation Lumbricals, 3 and 4
Deep branch of the ulnar nerve (C8, T1) main segmental T1
What is the action of the Lumbricals, 3 and 4
Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th fingers
What is the origin of the Dorsal Interossei 1-4
Adjacent of two metacarpals (as bipennate muscles)
What is the insertion of Dorsal Interossei 1-4
Bases of proximal phalanges; extensor expansions of 2nd-4th fingers
What is the innervation of Dorsal Interossei 1-4
Deep Branch of Ulnar Nerve (C8,T1) main seg T1
What is the action of the Dorsal Interossei 1-4
Abduct 2-4th fingers from axial line; act with lumbricals in flexing metacarpophalangeal joints and extending interphalangeal jionts
What is the origin of the Palmar Interossei 1-3
Palmar Surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
What is the insertion of Palmar Interossei 1-3
bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th fingers
What is the innervation of Palmar Interossei 1-3
Deep Branch of the Ulnar Nerve (C8, T1) main seg T1
What is the action of the Palmar Interossei 1-3
Adduct 2nd, 4th, and 5th fingers toward axial line; assists lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
