The Leg - Deep Posterior Compartment

Question 1

(O) Superior/proximal attachment:
POSTERIOR TIBIA, INTEROSSEOUS MEMBRANE, FIBULA

(I) Inferior/distal attachment:
NAVICULAR TUBEROSITY + SURROUNDING BONES
*** 8 inferior attachments in total!

Actions:
PLANTAR FLEXION
INVERSION

Answer 1

TIBIALIS POSTERIOR

Question 2

(O) Superior/proximal attachment:
LOWER 2/3RDS OF POSTERIOR FIBULA, INTEROSSEOUS MEMBRANE

(I) Inferior/distal attachment:
PLANTAR SURFACE OF 1ST DISTAL PHALANX

Actions:
1ST MTP, 1ST IP FLEXION
PLANTAR FLEXION

Answer 2

FLEXOR HALLUCIS LONGUS

FHL

Question 3

(O) Superior/proximal attachment:
POSTERIOR MIDDLE TIBIA

(I) Inferior/distal attachment:
PLANTAR SURFACE OF DISTAL PHALANGES OF LATERAL 4 TOES

Actions:
PIP/DIP, MTP FLEXION OF 2ND-5TH TOES
PLANTAR FLEXION

Answer 3

FLEXOR DIGITORUM LONGUS

FDL

Question 4

Which muscle attaches superiorly and proximally at the posterior tibia, interosseous membrane, and fibula?

Answer 4

TIBIALIS POSTERIOR

Question 5

Which muscle attaches inferiorly and distally at the navicular tuberosity, and onto many surrounding bones?

*** 8 inferior attachments in total!

Answer 5

TIBIALIS POSTERIOR

Question 6

The three deep posterior muscles which act as synergists to plantar flexion are know as?

Answer 6

TIBIALIS POSTERIOR
\+
FLEXOR HALLUCIS LONGUS (FHL)
\+
FLEXOR DIGITORUM LONGUS (FDL)

Question 7

Tibialis Posterior is responsible for the actions of ______ _______ and ________.

Answer 7

PLANTAR FLEXION
and
INVERSION

Question 8

Which muscle attaches superiorly and proximally (O) to the lower 2/3rds of posterior fibula and the interosseous membrane?

Answer 8

FLEXOR HALLUCIS LONGUS

FHL

Question 9

Which muscle attaches inferiorly and distally to the plantar surface of the 1st distal phalanx?

Answer 9

FLEXOR HALLUCIS LONGUS

FHL

Question 10

Which muscle is responsible for flexion of the 1st MTP and 1st IP?

***Activated by slowly wiggling first toe

Answer 10

FLEXOR HALLUCIS LONGUS

FHL

Question 11

Which muscle attaches superiorly and proximally to the posterior middle tibia?

Answer 11

FLEXOR DIGITORUM LONGUS

FDL

Question 12

Which muscles attaches inferiorly and distally to the plantar surface of the distal phalanges of lateral 4 toes?

Answer 12

FLEXOR DIGITORUM LONGUS

FDL

Question 13

Which muscle is responsible for the actions of PIP/DIP, and MTP flexion of 2nd-5th toes?

***Activated by slowly wiggling toes

Answer 13

FLEXOR DIGITORUM LONGUS

FDL

Question 14

The muscle tendons of the deep posterior compartment (tibialis posterior, FHL, FDL) pass behind which bony landmark?

Answer 14

MEDIAL MALLEOLUS

Question 15

Name the strong fibrous band which forms the tarsal tunnel?

_____ ________

Answer 15

FLEXOR RETINACULUM

Question 16

The flexor retinaculum forms a tunnel called the _____ _____

Answer 16

TARSAL TUNNEL

Question 17

From anterior to posterior, what is the order of the muscles of the deep posterior compartment?

Answer 17

TIBIALIS POSTERIOR
to
FLEXOR HALLUCIS LONGUS (FHL)
to
FLEXOR DIGITORUM LONGUS (FDL)