DIGITAL EXTENSORS and FLEXORS OF FL

Question 1

DIGITAL EXTENSORS

Answer 1

1. m. extensor digitorum communis
2. m. extensor digitorum lateralis
3. m. extensor digiti I. et II.
4. m. abductor digiti I. [pollicis] longus

INNERVATED BY: N.RADIALIS
+ SUPPINATORS:
M. SUPINATOR
(M. BRACHIORADIALIS)

Question 2

DIGITAL EXTENSORS

Intersp. Diff CA/EQ

Answer 2

?

Question 3

1. m. extensor digitorum communis

Answer 3

O: lateral epicondyle of humerus

I: proc. extensorius of distal phalanx of digits II-V.

A: extends carpus and joints of digits II-V.

Question 4

2. m. extensor digitorum lateralis

Answer 4

O: lateral humeral epicondyle,
lig. collaterale laterale

I: goes to digits III-V., at the level of 1st digit

• it unites with tendons from common digital extensor and interosseous muscles,
• inserts on distal phalanx (proc. ext.)

A: extends carpus and joints of digits III-V.

Question 5

3. m. extensor digiti I. et II.

Answer 5

M. extensor digiti I. et II. [pollicis et indicis]

O: middle third of ulna (laterally)
(adjacent to m. abductor digiti I. longus)

I:

• pollicis: head of Mc. I.,
• indicis: unites with common digital extensor, thus together are inserting
• on distal phalanx of digit II.

A: extends digits I-II., indicis adducts dew claw
(which is not in contact with the ground)

Question 6

4. m. abductor digiti I. [pollicis] longus

Answer 6

O: adjacent lateral surface of radius and ulna,
and from interosseous membrane

I: Mc. I. base (medially)

A: extends and abducts digit I.

Question 7

M. SUPINATOR

Answer 7

It’s also called m. supinator brevis

O: lateral epicondyle of humerus, lateral collateral ligament

I: cranial surface on proximal part of radius

A: supinates forearm and forefoot
(rotates arm laterally)

Question 8

(M. BRACHIORADIALIS)

Answer 8

It’s also called m. supinator longus.
Just about 33% of the dogs have it

O: lateral supracondylar crest, above m. ext. carpi radialis

I: distally and medially on radius

A: supinates forearm and forefoot (rotates arm laterally)

Question 9

DIGITAL FLEXORS

Answer 9

1. m. flexor digitorum superficialis
2. m. flexor digitorum profundus
   (caput humerale, radiale et ulnare)

+ PRONATORS

3. m. pronator teres
4. m. pronator quadratus

INNERVATED by N.MEDIANUS

Question 10

1. m. flexor digitorum superficialis

Answer 10

O: medial epicondyle of humerus

I: middle phalanx of digits II-V.
(palmar surface)

A: flexes carpus and affected joints of digits II-V.

Question 11

2. m. flexor digitorum profundus

caput humerale, radiale et ulnare

Answer 11

O:
3 heads
1. caput humerale:
from medial epicondyle of humerus,
2. caput radiale proximo-medially from radius, and
3. caput ulnare proximo-caudally from ulna

I: distal phalanx of digits I-V.
(palmar surface, on the last phalanges’ flexor tubercle)

A: flexes carpus and joints of digits I-V.

Question 12

3. m. pronator teres

Answer 12

O: medial epicondyle of humerus

I: craniomedial surface of radius’ upper part

A: pronates forearm (rotates arm medially)

Question 13

4. m. pronator quadratus

Answer 13

O and I:
connects apposed surfaces of radius and ulna, fills interosseous space (medially)

A: pronates forearm (rotates arm medially)