muscles of the extremities

Muscles of the Extremities

Justin R. StoneAH 129

Tortora: Ch 11

Muscles:Intrinsic Hand Muscles

Upper ExtremityAdductor PollicisAbductor Pollicis BrevisOpponens PollicisFlexor Pollicis BrevisAbductor Digiti MinimiFlexor Digiti Minimi BrevisLumbricalsPalmar InterosseiDorsal Interossei

Muscles:Intrinsic Hand Muscles: THUMB

Upper Extremity: Intrinsic Hand Muscles: THUMB

Adductor PollicisAbductor Pollicis BrevisOpponens PollicisFlexor Pollicis Brevis

Upper Extremity:Intrinsic Hand Muscles: THUMB

Adductor Pollicis◦O/I:

O: Oblique Head: Capitate and 2nd-3rd Metacarpals O: Transverse Head: 3rd Metacarpal I: Medial aspect of proximal phalynx of thumb

(CONTAINS SESMOID)◦N: Ulnar◦A: Adducts Thumb at CMC and MCP

Adductor Pollicis

Upper Extremity:Intrinsic Hand Muscles: THUMB

Abductor Pollicis Brevis◦O/I:

O: Flexor retinaculum, scaphoid, trapezium I: Lateral aspect of 1st proximal phalynx

◦N: Median◦A: Abducts thumb at CMC

Abductor Pollicis

Brevis

Upper Extremity:Intrinsic Hand Muscles: THUMB

Opponens Pollicis◦O/I:

O: Flexor Retinaculum, Trapezium I: Lateral aspect of 1st Metacarpal

◦N: Median◦A: Opposition (Moves thumb to meet tip of 5th finger at CMC)

Opponens Pollicis

Upper Extremity:Intrinsic Hand Muscles: THUMB

Flexor Pollicis Brevis◦O/I:

O: Flexor Retinaculum, Trapezium, Trapezoid, Capitate

I: Lateral aspect of 1st proximal phalynx◦N: Median and Ulnar◦Flex Thumb at CMC and MCP

Flexor Pollicis

Brevis

Upper Extremity: Intrinsic Hand MusclesTHUMB

Lab: Intrinsic Hand Muscles: Thumb◦Color: Netter’s◦Color: Sieg and Adams p.46-49 ◦Flashcards◦Palpate: O/I of Intrinsic Hand Muscles of the

Thumb and Palpate muscle while performing Action

Muscles:Intrinsic Hand Muscles: 5th FINGER

Upper Extremity: Intrinsic Hand Muscles: 5th FINGER

Abductor Digiti MinimiFlexor Digiti Minimi Brevis

Opponens Digiti Minimi

Upper Extremity:Intrinsic Hand Muscles: 5th FINGER

Abductor Digiti Minimi◦O/I:

O: Pisiform, tendon of flexor carpi ulnaris I: Medial aspect of 5th proximal phalanx

◦N: Ulnar◦A: Abducts and Flexes 5th finger at MCP

Abductor Digiti Minimi

Upper Extremity:Intrinsic Hand Muscles: 5th FINGER

Flexor Digiti Minimi (Brevis)◦O/I:

O:Flexor retinaculum, hamate I: Medial aspect of 5th proximal phalanx

◦N: Ulnar◦A: Flexes 5th finger at CMC and MCP

Flexor Digiti Minimi (Brevis)

Upper Extremity:Intrinsic Hand Muscles: 5th FINGER

Opponens Digiti Minimi◦O/I:

O: Flexor retinaculum, hamate I: Medial aspect of 5th metacarpal

◦N: Ulnar◦A: Opposition (moves 5th finger at CMC across palm to meet tip of 1st finger)

Opponens Digiti

Minimi

Opponens Digiti

Minimi

Upper Extremity: Intrinsic Hand Muscles 5th FINGER

Lab: Intrinsic Hand Muscles: 5th Finger◦Color: Netter’s◦Color: Sieg and Adams p.50-52◦Flashcards◦Palpate: O/I of Intrinsic Hand Muscles of the 5th

Finger and Palpate muscle while performing Action

Muscles:Intrinsic Hand Muscles

Upper Extremity: Intrinsic Hand Muscles

LumbricalsPalmar InterosseiDorsal Interossei

Upper Extremity:Intrinsic Hand Muscles

Lumbricals: 4◦O/I:

O: Flexor Digitorum Profundus Tendons I: Extensor Expansion of Dorsal Hand (Aponeurosis

of Tendons of Extensor Digitorum Muscles)◦N: Median and Ulnar◦A: Allow Flexion at MCP while maintaining Extension at IP

**2 Unipennate, 2 Bipennate

Lumbrica

ls

Upper Extremity:Intrinsic Hand Muscles

Palmar Interossie: 3◦O/I:

O: Palmar Aspect of Shaft of 2nd, 4th, and 5th Metacarpals

I: Base of Proximal Phalanges and Extensor Expansion of 2nd, 4th, and 5th Metacarpals

◦N: Ulnar◦A:

Adduct 2nd, 4th, and 5th Fingers (PAD) Assist in Flexion of 2nd, 4th, and 5th Fingers

**Unipennate

Palmar Interossei

Upper Extremity:Intrinsic Hand Muscles

Dorsal Interossei: 4◦O/I:

O: Each has 2 heads, Arising from Dorsal Surfaces of Adjacent Metacarpals

I: Extensor Expansion and Proximal Base of 2nd, 3rd, and 4th Phalanges

◦N: Ulnar◦A:

Abducts 2nd, 3rd, and 4th fingers (DAB) Assists in Flexion of 2nd, 3rd, and 4th fingers Assists in Extension of all fingers

**Bipennate

Dorsal Interossei

Upper Extremity: Intrinsic Hand Muscles

Lab: Intrinsic Hand Muscles◦Color: Netter’s◦Color: Sieg and Adams p.53-55◦Flashcards◦Palpate: O/I of Intrinsic Hand Muscles and

Palpate muscle while performing Action