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Bio 634 Palm
Origin, insertion, action, innervation
11
Anatomy
Graduate
09/29/2017

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Cards

Term
Palmaris Brevis
Definition
O: Flexor Retinaculum: Palmar aponeurosis
I: Skin at ulnar side of hand
Inn: Ulnar Nerve(Superficial branch)
Action: Draws skin at ulnar side of palm toward middle of hand
Term
Abductor Digiti Minimi
Definition
O: Pisiform: Tendon of Flexor Carpi Ulnaris
I: Base of proximal phalanx of 5th digit
Inn: Ulnar Nerve(deep palmar branch)
Action: Abducts 5tth digit
Term
Flexor Digiti Minimi Brevis
Definition
O: Hook of hamate: Flexor retinaculum
I: Base of Proximal Phalanx of 5th digit
Inn: Ulnar Nerve
Action: Flexes proximal phalanx of 5th digit
Term
Opponens digiti minimi
Definition
O: Hook of Hamate, Flexor Retinaculum
I: 5th Metacarpal
Inn: Ulnar nerve(deep palmar branch)
Action: Draws 5th metacarpal forward to face thumb: Deepens hollow of hand
Term
Abductor Pollicus Brevis
Definition
O: Scaphoid, Trapezium, Flexor Retinaculum
I: Base of Proximal Phalanx of Thumb
Inn: Median nerve (Recurrent branch)
Term
Flexor Pollicus Brevis
Definition
O: Trapezium, Flexor retinaculum
I: Base of proximal phalanx of thumb
Inn: Median Nerve (Recurrent branch)
Action: Flexes proximal phalanx of thumb.
Term
Opponens Pollicus
Definition
O: Trapezium, Flexor Retinaculum
I: Radial side of shaft of 1st met
Innervation: Median Nerve(Recurrent brach)
Action: Abducts, flexes, and medially rotates 1st metacarpal
Term
Adductor Pollicus
Definition
O: (oblique head) Trapezium, trapezoid, capitate, bases of 2nd and 3rd metacarpals.
(Transverse head) Ant. Surface of 3rd metacarpal
I: Base of Proximal phalanx of thumb.
Innervation: Ulnar nerve (deep palmar branch)
Action: Adducts thumb at CMC and MCP joints.
Term
Lumbricals
Definition
O: Tendon of flexor digitorum profundus
I: Extensor expansion hoods of digits 2-5
Inn: Ulnar nerve(Medial two) Median Nerve(Lateral two)
Action: Flexes MCP joint, Extends interphalangeal joints.
Term
Palmar Interossei
Definition
O: Unipennate attachments from palmar surface of metacarpals 2,4,5
I: Extensor expansion hoods of digits 2,4,5
Innervation: Ulnar nerve deep palmar branch.
Action: Adduct digit 2,4,5 (also important in maintaining interphalangeal extension with MCP flexion)
Term
Dorsal Interossei
Definition
O: Bipennate attachment from adjacent metacarpals
I: Bases of proximal phalanges 2-4 (also extensor expansion hoods)
Inn: Ulnar nerve (deep plamar branch)
Action: Abducts digit 2-4: Also acts on extensor expansion.
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