Palm of the Hand Muscles Flashcards
Adductor Pollicis Brevis
Origin
-Flexor rentinaculum and tubercles of scaphoid and trapezium
Adductor Pollicis Brevis
Insertion
-Lateral side of base of proximal phalanx of thumb
Adductor Pollicis Brevis
Innervation
-Recurrent branch of median nerve (C8, T1)
Adductor Pollicis Brevis
Action
- Abducts thumb
- Opposes thumb
Opponens Pollicis
Origin
-Flexor rentinaculum and tubercles of scaphoid and
trapezium
Opponens Pollicis
Insertion
-Lateral side of 1st metacarpal
Opponens Pollicis
Innervation
-Recurrent branch of median nerve (C8, T1)
Opponens Pollicis
Action
-Opposes thumb
Flexor Pollicis Brevis
Origin
-Flexor rentinaculum and tubercles of scaphoid and
trapezium
Flexor Pollicis Brevis
Insertion
-Lateral side of base of proximal phalanx of thumb
Flexor Pollicis Brevis
Innervation
-Superficial head: recurrent branch of median nerve
(C8, T1)
-Deep head: deep branch ofulnar nerve (C8, T1)
Flexor Pollicis Brevis
Action
-Flexes MCP of 1st digit (thumb)
Flexor Digiti Minimi Brevis
Origin
-Hook of hamate and flexor rentinaculum
Flexor Digiti Minimi Brevis
Innervation
-Medial side of base of proximal phalanx of 5th digit
Flexor Digiti Minimi Brevis
Insertion
-Deep branch of ulnar nerve (C8, T1)
Flexor Digiti Minimi Brevis
Action
-Flexes MCP of 5th digit
Abductor Digiti Minimi
Origin
-Pisiform
Abductor Digiti Minimi
Insertion
-Medial side of base of proximal phalanx of 5th digit
Abductor Digiti Minimi
Innervation
-Deep branch of ulnar nerve (C8, T1)
Abductor Digiti Minimi
Action
-Abducts & flexes MCP of 5th digit
Opponens Digiti Minimi
Origin
-Hook of hamate and flexor rentinaculum
Opponens Digiti Minimi
Insertion
-Medial border of 5th metacarpal
Opponens Digiti Minimi
Innervation
-Deep branch of ulnar nerve (C8, T1)
Opponens Digiti Minimi
Action
-Opposes 5th digit
Palmaris Brevis
Origin
-Palmar aponeurosis
Palmaris Brevis
Insertion
-Skin of hand on ulnar side
Palmaris Brevis
Innervation
-Superficial branch of ulnar nerve (C8, T1)
Palmaris Brevis
Action
-Tenses skin of palmar fascia
Adductor Pollicis
Origin
-Oblique head: base of 2nd and 3rd metacarpals;
trapezoid & capitate
-Transverse head: anterior surface of 3rd metacarpal
Adductor Pollicis
Insertion
-Medial side of base of proximal phalanx of thumb
Adductor Pollicis
Innervation
-Deep branch of ulnar nerve (C8, T1)
Adductor Pollicis
Action
-Adducts thumb
Lumbricals (1st & 2nd)
Origin
-Lateral two tendons of flexor digitorum profundus
as unipennate muscles
Lumbricals (1st & 2nd)
Insertion
-Lateral sides of extensor expansions of 2nd-3rd digits
Lumbricals (1st & 2nd)
Innervation
-Median nerve (C8, T1)
Lumbricals (1st & 2nd)
Action
-Flexes MCP joints and extends IP joints of 2nd-3rd
digits
Lumbricals (3rd & 4th)
Origin
-Medial three tendons of flexor digitorum profundus
as bipennate muscles
Lumbricals (3rd & 4th)
Insertion
-Lateral sides of extensor expansions of 4th-5th digits
Lumbricals (3rd & 4th)
Innervation
-Deep branch of ulnar nerve (C8, T1)
Lumbricals (3rd & 4th)
Action
-Flexes MCP joints and extends IP joints of 4th-5th
digits
Dorsal Interossei (1st - 4th) Origin
-Adjacent sides of two metacarpals (as bipennate
muscles)
Dorsal Interossei (1st - 4th) Insertion
-Bases of proximal phalanges and extensor expansions of 2nd-4th digits
Dorsal Interossei (1st - 4th) Innervation
-Deep branch of ulnar nerve (C8, T1)
Dorsal Interossei (1st - 4th) Action
-Abducts 2nd-4th digits from axial line;
-Acts with lumbricals to flex MCP joints and extend
IP joints
-1st dorsal interosseous adducts thumb
Palmer Interossei (1st - 3rd) Origin
-Palmar surfaces of 2nd, 4th, and 5th metacarpals (as unipennate muscles)
Palmer Interossei (1st - 3rd) Insertion
-Bases of proximal phalanges; extensor expansions of 2nd, 4th , and 5th digits
Palmer Interossei (1st - 3rd) Innervation
-Deep branch of ulnar nerve (C8, T1)
Palmer Interossei (1st - 3rd) Action
-Adducts 2nd, 4th , and 5th digits toward axial line;
-Acts with lumbricals to flex MCP joints and extend
IP joints
