2.9 Muscles of the Pelvic Limb: Muscles on the Dorsal and Plantar Surface of the Pes and Special Muscles of Digit 1

Muscles on the Dorsal and Plantar Surface of the Pes and Special Muscles of Digit 1

Short digital extensor

name the Muscles on the Dorsal Surface (1)

Short digital extensor

• divided into 3 heads: Lateral, Intermediate, and Medial head

• Origin: arises from the distal part of the calcaneus and on the ligamentous tissue on the flexor surface of the tarsus

• Insertion: inserts on digit IV (lateral head), digits III and IV (intermediate head), and digit II and III (medial head) in mediolateral sequence

• Action: to extend the digits

• Innervation: Peroneal nerve

Lumbricales

Interflexorii

Quadratusplantae

Abductor digiti V

name the Muscles on the Plantar Surface of the Pes (4)

Lumbricales

• muscles on the plantar surface of the pes that is similar to those in the thoracic limb

Interflexorii

• Origin: arises from the metatarsal pad, from the plantar surface of the tendon of the deep digital flexor proximal to the tarsus

• Insertion: inserts on the metatarsophalangeal joints on the tendons of DDF of digits III and IV.

Quadratus plantae

• Origin: arises from the lateral tuberosity of the calcaneus and the lateral collateral ligament of the tarsus

• Insertion: inserts on the tendons of the deep digital flexor

• well-developed/ stronger in cats than in dogs

Abductor digiti V

• Origin: arises from the lateral aspect of tuber calcanei, deep to the tendon of superficial digital flexor

• Insertion: inserts on the base of 5th metatarsal bone, together with the fibularis brevis

Abductor digiti I

Flexor digit I brevis

Adductor digiti I

name the Special Muscles of the Digit I (3)

FALSE: it is usually absent in most species of dogs

TRUE OR FALSE: the special muscles of the digit 1 is usually present in most species of dogs