muscles of hand
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21 Terms
what makes up the Thenar group?
Flexor Pollicis Brevis
Abductor Pollicis Brevis
Opponens Pollicis
What does the muscles of the thenar group have in common?
O: Flexor retinculum, scaphoid, trapezium
Inn: Median Nerve
Blood supply: Radial Artery
What is A? ( Origin, insertion, action, and innervation)
Abductor pollicis brevis
O: Flexor retinculum, scaphoid, trapezium
Ins: Lateral aspect of proximal phalanx
Act: abducts thumb at CMC joint
Inn: Median Nerve
What is B? ( Origin, insertion, action, and innervation)
Flexor pollicis brevis
O: Flexor retinculum, scaphoid, trapezium
Ins: proximal phalanx
Act: Flexes thumb at CMC/MCP joint
Inn: Median Nerve
What muscle is this?
Opponens pollicis
O: Flexor retinculum, scaphoid, trapezium
Ins: Lateral aspect of 1st metacarpal
Act: opposes thumb at CMC joint
Inn: Median Nerve
What makes up the hypothenar muscles?
Flexor Digiti Minimi brevis
Abductor digiti Minimi brevis
Opponens digiti minimi brevis
What is C? ( Origin, insertion, action, and innervation)
Abductor digiti minimi Brevis
O: pisiform
Ins: Medial 5th proximal phalanx
Act: abduct little finger at MCP joint
Inn: Ulnar Nerve
What is D? ( Origin, insertion, action, and innervation)
Flexor digiti minimi Brevis
O: Hamate and flexor retinaculum
Ins: base 5th proximal phalanx
Act: flexes little finger at MCP joint
Inn: Ulnar Nerve
What is A?( Origin, insertion, action, and innervation)
Opponens digiti minimi Brevis
O: Hamate and flexor retinaculum
Ins: Medial 5th metacarpal
Act: opposes little finger at MCP joint
Inn: Ulnar Nerve
What is E?
Opponens digiti minimi Brevis
What is B?
flexor digit minimi brevis
What is C?
Abductor digit minimi brevis
What is this? ( Origin, insertion, action, and innervation)
Lumbricals
O: Tendons of flexor digitorum profundus for 2-5 digits
Ins: Extensor expansion digits 2-5
Act: Flexes at MCPS, Extends at PIPs. DIP of digits 2-5
Inn: Median (1&2) ;Ulnar Nerve (3&4)
What muscle flexes MCP and extends Intephalangeals ?
Lumbricals
What is the green?
Dorsal interossei
What muscle is this? ( Origin, insertion, action, and innervation)
Dorsal interossei
O: Adjacent metacarpals
Ins: bases of proximal phalanges and extensor expansion of digits 2-4
Act: abducts fingers 2-4 at MCPs
Inn: Ulnar Nerve
What is B? ( Origin, insertion, action, and innervation)
Palmar interossei
O: 2nd, 4th, 5th, metacarpals
Ins: bases of proximal phalanges and extensor expansion of digits 2, 4 and 5
Act: adducts fingers 2, 4, and 5 at MCPs
Inn: Ulnar Nerve
What is A? (Origin, insertion, action, and innervation)
Adductor Pollicis
O: base of 2nd and 3rd metacarpal and ANT surface of 3rd metacarpal
Ins: medial base of 1st proximal phalanx
Act: adducts thumbs at CMC joints
Inn: Ulnar Nerve
What group is pink and Blue?
Pink = Thenar muscles
Blue = Hypothenar muscles
Label each muscle
flexor pollicis brevis
abductor pollicis brevis
Opponens pollicis
flexor digitorum minimi brevis
abductor digitorum minimi
Opponens digitorum minimi
Note 
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