muscles of hand

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

1. flexor pollicis brevis

2. abductor pollicis brevis

3. Opponens pollicis

4. flexor digitorum minimi brevis

5. abductor digitorum minimi

6. Opponens digitorum minimi