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Thenar & Hypothenar Compartments of Hand (Hypothenar (Flexor Digiti…
Thenar & Hypothenar Compartments of Hand
Hypothenar
Flexor Digiti Minimi
I: Medial Border of 5th metacarpal
A: Opposes 5th metacarpal into thumb & rotates
O: Hook of hamate & flexor retinaculum
N: Deep Branch of Ulnar n.
(C8. T1)
Opponens Digiti Minimi
I: Medial Border of 5th metacarpal
A: Opposes 5th metacarpal into thumb & rotates
O: Hook of hamate & flexor retinaculum
N: Deep Branch of Ulnar n.
(C8. T1)
Abductor Digiti Minimi
I: Medial Side of base of proximal phalanx of 5th digit
A: ABD 5th digit, helps with flexion of PIP
O : Pisiform
N: Deep Branch of Ulnar n.
(C8. T1)
Thenar
Abductor Pollicis Brevis
I: Medial side of base of proximal phalanx of 5th
A: Abduction of thumb, helps oppose it
O: Pisiform
N: Recurrent branch of Median N.
(C8, T1)
Flexor Pollicis Brevis
I: lateral side of base of proximal phalanx of thumb
A: Flexes proximal phalanx of thumb
O: Sup head - flexor retinaculum & tubercles of scaphoid & trapezium
N: Sup head - Recurrent branch of Median N. Deep Head - Deep branch of ulnar n.
Sup head - (C6-T1) Deep Head - (C8-T1)
Opponens Digiti
A: Draws 5th metacarpal anterior & rotates it, bringing 5th digit into opposition with thumb
I: Medial border of 5th metacarpal
N: Deep branch of Ulnar N.
(C8, T1)
O: Hook of hamate & flexor retinaculum