Upper limb and back: Palm of hand

Question 1

What are the three thenar muscles?

Answer 1

-Abductor pollicis brevis m.
-Flexor pollicis brevis m.
-Opponens pollicis m.

Question 2

What is the origin, insertion, action and innervation of the thenar muscles?

Answer 2

ORIGIN
-Flexor retinaculum.
INSERTION
-Palmar surface of metacarpal I and proximal phalanx of the thumb.
ACTION
-APB: Abducts the thumb.
-FPB: Flexes the thumb.
-OP: Opposes the thumb.
INNERVATION
-Median n.

Question 3

What are the three hypothenar muscles?

Answer 3

-Abductor digiti minimi.
-Flexor digiti minimi brevis
-Opponens digiti minimi

Question 4

What is the origin, insertion, action and innervation of the hypothenar muscles?

Answer 4

ORIGIN
-Flexor retinaculum
INSERTION
-Palmar surface of metacarpal V and proximal phalanx of the little finger.
ACTION
-ADM: Abducts the little finger.
-FDMB: Flexes the little finger.
-ODM: Opposes the little finger.
INNERVATION
-Ulnar nerve

Question 5

What is the origin, insertion, action and innervation of the adductor pollicis muscle?

Answer 5

ORIGIN
-Transverse and oblique heads of metacarpal II and III.
INSERTION
-Proximal phalanx of the thumb.
ACTION
-Adducts the thumb.
INNERVATION
-Ulnar nerve

Question 6

What is the origin, insertion, action and innervation of the lumbrical muscles?

Answer 6

ORIGIN
-Tendons of flexor digitorium profundus m.
INSERTION
-Extensor hoods of medial four fingers.
ACTION
-Flexion of the metacarpophalangeal joint while extending the interphalangeal joints.
INNERVATION
-Medial 2: Ulnar nerve
-Lateral 2: Median nerve

Question 7

How many palmar interossei mm. do we have?

Answer 7

Three

Question 8

How many dorsal interossei mm. do we have?

Answer 8

Four

Question 9

What is the origin, insertion, action and innervation of the palmar interossei muscles?

Answer 9

ORIGIN
-Side of metacarpals.
INSERTION
-Extensor hoods
ACTION
-Adduction of the digits at the metacaporphalangeal joints.
INNERVATION
-Ulnar nerve

Question 10

What is the origin, insertion, action and innervation of the dorsal interossei muscles?

Answer 10

ORIGIN
-Side of metacarpals
INSERTION
-Extensor hoods
ACTION
-Abduction of the middle three fingers at the metacarpophalangeal joints.
INNERVATION
-Ulnar nerve