Muscle Chart: Hand And Thumb

Question 1

Abductor Pollicis Brevis

Origin, Insertion, Innervation, Blood Supply

Answer 1

Origin: Flexor retinaculum, scaphoid and trapezium

Insertion: Base of the proximal phalanx of thumb (onto sesamoid bone)

Innervation: Recurrent branch median (C6, 7, 8, T1)

Blood Supply: Superficial palmar arch

Question 2

Abductor Pollicis Brevis Movements

Answer 2

Abducts and assists in opposition of the thumb

Question 3

Flexor Pollicis Brevis

Origin, Insertion, Innervation, Blood Supply

Answer 3

Origin: Superficial Head - Flexor retinaculum; Deep Head - Trapezium, trapezoid and capinate

Insertion: Base of proximal phalanx of the thumb (onto sesamoid bones)

Innervation: Superficial Head - Recurrent branch median nerve (C6, 7, 8, T1) Deep Head: Deep branch ulnar (C8, T1)

Blood Supply: Superficial palmar arch

Question 4

Flexor Pollicis Brevis Movements

Answer 4

Flexes the CMC and MCP joints of the thumb

Question 5

Opponens Pollicis

Origin, Insertion, Innervation, Blood Supply

Answer 5

Origin: Flexor retinaculum and trapezium

Insertion: Radial side of 1st metacarpal

Innervation: Recurrent branch median nerve (C6, 7, 8, T1) and deep branch of ulnar nerve

Blood Supply: Superficial palmar arch

Question 6

Opponens Pollicis Movements

Answer 6

Opposes the thumb at the CMC joint

Question 7

Abductor Digiti Minimi

Origin, Insertion, Innervation, Blood Supply

Answer 7

Origin: Pisiform and tendon of flexor carpi ulnaris

Insertion: Base of proximal phalanx digit 5

Innervation: Ulnar nerve branch (C7, 8, T1)

Blood Supply: Ulnar Artery (Superficial Branch)

Question 8

Abductor Digiti Minimi Movements

Answer 8

Abducts digit 5 at CMC and MCP joints

Question 9

Flexor Digiti Minimi Brevis

Origin, Insertion, Innervation, Blood Supply

Answer 9

Origin: Hook of the hamate and flexor retinaculum

Insertion: Base of proximal phalanx of digit 5

Innervation: Ulnar nerve deep branch (C7. 8, T1)

Blood Supply: Ulnar artery - superficial branch

Question 10

Flexor Digiti Minimi Brevis Movements

Answer 10

Flexes digit 5 at the CMC and MCP joint

Question 11

Opponens Digiti Minimi

Origin, Insertion, Innervation, Blood Supply

Answer 11

Origin: Hook of hamate and flexor retinaculum

Insertion: Shaft of 5th metacarpal

Innervation: Ulnar nerve (deep branch) (C7, 8, T1)

Blood Supply: Ulnar artery (superficial branch)

Question 12

Opponens Digiti Minimi Movements

Answer 12

Opposition of digit 5 at the CMC joint

Question 13

Lumbricals (1-4)

Origin, Insertion, Innervation, Blood Supply

Answer 13

Origin: 
1 — FDP tendon of digit 2
2 — FDP tendon of digit 3
3 — FDP tendon of digits 3 and 4
4 — FDP tendons of digits 4 and 5

Insertion: 
1 — Extensor expansion (EE) of digit 2
2 — EE of digit 3
3 — EE of digit 4
4 — EE of digit 5

Innervation:
Digits 2 and 3 — Median nerve (C6, 7, 8, T1)
Digits 4 and 5 — Deep branch ulnar nerve (C7, 8, T1)

Blood Supply: Deep palmar arch

Question 14

Lumbricals (1-4) Movements

Answer 14

Flexion of MCP joints digits 2-5; extension of IP joints digits 2-5

Question 15

Palmar Interossei (1-3)

Origin, Insertion, Innervation, Blood Supply

Answer 15

Origin: Palmar surface of base of metacarpals 1, 2, 4 and 5

Insertion: Base of proximal phalanx of the related finger and extensor aponeurosis/expansion

Innervation: Deep branch ulnar nerve (C8, T1)

Blood Supply: Deep palmar arch

Question 16

Palmar Interossei (1-3) Movements

Answer 16

Adducts digits 1, 2, 4, and 5 towards digit 3

Question 17

Dorsal Interossei (1-4)

Origin, Insertion, Innervation, Blood Supply

Answer 17

Origin: Adjacent sides of 2 neighboring metacarpals

Insertion: Ext. expansions and bases of the proximal phalanges of digits 2-4

Innervation: Deep branch ulnar nerve (C8, T1)

Blood Supply: Deep palmar arch

Question 18

Dorsal Interossei Movements

Answer 18

Abducts digits 2-4

Question 19

Adductor Pollicis

Origin, Insertion, Innervation, Blood Supply

Answer 19

Origin: Oblique Head — 2nd and 3rd metacarpals, capitate and trapezoid; Transverse Head — 3rd metacarpal

Insertion: Base 1st proximal phalanx on medial surface

Innervation: Deep branch of ulnar nerve (C8, T1)

Blood Supply: Deep palmar arch

Question 20

Adductor Pollicis Movements

Answer 20

Adducts 1st CMC joint and assist with flexion of the CMC and MCP joint of thumb