Interosseus and lumbrical muscles

Question 1

What are the lumbrical and interosseus MM?

Answer 1

lumbricals
palmar interosseus
dorsal interosseus

Question 2

What are the lumbricals and the interosseous MM innervated by?

Answer 2

deep ulnar nerve except lumbricals of digits 2&3

Question 3

What are the attachments of the lumbricals?

Answer 3

radial sides of tendons of flexor digitorum profundus. passes around the radial side of the digits to insert on the extensor expansion with the interosseus MM

Question 4

What is the action of the lumbricals?

Answer 4

assist in flexion of MP joints and IP joints.

Question 5

What does the lumbricals connect?

Answer 5

FDP tendon to the EDP tendon
contraction of lumbricals will short circuit the FDP so that its contraction will pull on the extensor tendons and affect extension not flexion of the digits

Question 6

What are the 2&3 lumbricals innervated by?

Answer 6

median N

Question 7

What are the attachments for the palmar interosseous MM?

Answer 7

palmar surface of the metacarpals 2 (ulnar side), 4 and 5 (radial side) to extensor expansion on the same side of the same digit

Question 8

what is the action of palmar inerosseous MM?

Answer 8

adduction of digits along with the common function of flexion of MP joints and extension of IP joints.

Question 9

What are the attachments for the dorsal interosseus MM?

Answer 9

bipinnate arising from the two adjacent metacarpal bones to the extensor expansion of its associated digits to the radial side of digits 2&3 and ulnar side of digits 3&4

Question 10

What is the action of the dorsal interosseus MM?

Answer 10

abduction of the digits, along with common function of flexion of MP joints and extension of IP joints
large first dorsal interosseous M