muscles of hand

what makes up the Thenar group?

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