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- Abductor Pollicis Brevis (Thenar Eminence)
- Origin: Tubercle of scaphoid, tubercle of trapezium, flexor retinaculum
- Insertion: Base of proximal phalanx of thumb
- Action: Abducts thumb, moves, it anteriorly, opposes thumb to other fingers (along with other thenar muscles)
- Nerve: Median
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- Opponenes Pollicis (Thenar Eminence)
- Origin: Tubercle of scaphoid, tubercle of trapezium
- Inserts: Later border of first metacarpal bone
- Action: Rotates thumb into opposition with fingers, acts together with other muscles of thenar to oppose thumb from other fingers
- Nerve: Median nerve
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- Flexor Pollicis Brevis (Thenar Eminence)
- Origin: Flexor retinaculum and trapezium, and first metacarpal bone
- Inserts: Base of proximal phalanx of thumb
- Action: Flexes metacarpophalangeal joint of thumb, assists in abduction and rotation of thumb, helps oppose thumb from others
- Nerve: Median (Lateral portion) and Ulnar (Medial Portion)
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- Adductor Pollicis
- Origin: Oblique head- anterior surface of second and third metacarpals, capitate, trapezoid
- Transverse head: anterior surface of third metacarpal bone
- Inserts: Medial side of base of proximal phalanx of the thumb
- Action: Adducts thumb
- Nerve: Ulnar nerve
- ***hurt really easily. Anytime forced abduction of the thumb. One of the bigger muscles so...
- ***Muscles with more lateral action has ulnar nerve probably
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- Palmaris Brevis
- Origin: flexor retinaculum, palmar aponeurosis
- Inserts: skin of the palm
- Action: corrugates skin of palm
- Nerve: ulnar nerve (C8)
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- Abductor Digiti Minimi
- Origin: Pisiform bone, tendon of flexor carpi ulnaris
- Insertion: Medial side of base of proximal of fifth finger
- Action: Abducts fifth finger
- Nerve: Ulnar nerve (C8,T1)
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- Flexor Digiti Minimi Brevis
- Origin: Anterior surface of flexor retinaculum, hook of hamate
- Inserts: Base of proximal phalanx of 5th finger
- ***be careful and remember the mid-line of the hand.
- Action:Abducts 5th finger
- Nerve: Ulnar
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- Opponens Digiti Minimi
- Origin: anterior surface of flexor retinaculum, hook of hamate
- Inserts: Whole length of medial border of fifth metacarpal bone
- Action: Rotates fifth metacarpal bone, draws fifth metacarpal bone forward, assists in flexors of fingers at metacarpephalangeal joints
- Nerve: Ulnar nerve (C8,T1)
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- Lumbricales (four muscles)
- Origin: Tendons of flexor digitorum profundus in palm
- Insertion: lateral side of corresponding tendon of extensor digitorum on fingers
- Action: Extend fingers at interphalangeal joints, weakly flex fingers at metacarpophalangeal joints.
- Nerve: Lateral lumbricals (1st and 2nd)- median nerve (C6,C7)
- Medial lumbricals (3rd and 4th)- ulnar nerve (C8)
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- Dorsal Interossei
- Action: Abduct fingers away from center of third fingers at metacarpophalangeal joints, assist in flexion of fingers at metacarpophalangeal joints. Helps spread hand out and move fingers away from the middle finger.
DABduction
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- Palamar Interossei
- Action: helps abduct the fingers and forcefully bring them together.
PADduction
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