Equine TL Ligaments, Bursas, Etc. Flashcards
What is the lacertus fibrosis?
Long tendon of the biceps brachii m.; extends from the biceps brachii to the extensor carpi radials mm.; a main component of the passive stay apparatus - prevents flexion at the elbow
Where do the medial and lateral extensor branches of the interosseous pass?
Dorsally to unite with the tendon of the common digital extensor
What is the proximal check ligament?
Accessory tendon of the SDF m.; arises from the caudodistal end of the radius and unites with the deep surface of the SDF tendon
What is the distal check ligament?
The accessory tendon of the DDF m.; arises from the proximopalmar aspect of MC III and unites with the deep surface of the DDF tendon
What is the suspensory ligament?
Another name of the interosseous m.; completely fibrous in horse; originates from the deep palmar carpal ligament and proximal palmar surface of MC III and inserts on the palmolateral and palmomedial surfaces of the proximal sesamoid bones
What takes its origin from the deep palmar carpal ligament?
The suspensory ligament/interosseus m.
What is significant about the deep palmar carpal ligament?
It forms the dorsal border of the carpal canal and prevents overextension of the carpal joints due to its attachment on the palmar surface of each carpal bone
What is significant about the palmar flexor retinaculum?
It forms the palmar boundary of the carpal canal; binds the SDF and DDF tendons in the carpal canal
What is the palmar annular ligament?
Retains the SDF and DDF tendons in position on the palmar surface of the proximal sesamoids
What is the intersesamoidean ligament?
Interconnects the lateral and medial proximal sesamoids; covered by the scutum
What is the scutum?
The shiny fibrocartilage on the palmar surface of the sesamoids, against which the tendon of the DDF tendon slides
What is the straight sesamoidean ligament?
Attaches the proximal sesamoids to the palmar surface of the proximal and middle phalanges; sometimes referred to as “I”
What is the oblique sesamoidean ligament?
Attaches the proximal sesamoids to the proximal phalanx; sometimes referred to as “V”
What is the cruciate sesamoidean ligament?
Deep to the straight and oblique sesamoidean ligaments; attaches the proximal sesamoids to the proximal phalanx; sometimes referred to as “X”
What is the proximal digital annular ligament?
A butterfly-shaped retaining fascial band that holds down the SDF and DDF tendons at the proximal phalanx
What is the distal digital annular ligament?
Fascial band that extends from the proximal phalanx to the distal phalanx; distally, extends between the digital cushion and tendon of the DDF and holds down the tendon of the DDF
Where is the navicular bone located?
On the palmar surface of the interphalangeal joint; also known as the distal sesamoid bone
Where is the impar ligament?
Attaches the distal sesamoid bone/navicular bone to the distal phalanx; also knows as the distal ligament of the distal sesamoid bone
Where is the navicular bursa?
The synovial sac between the distal sesamoid bone/navicular bone and the DDF tendon; very small and why we worry about nails going through the wrong place
Where is the infraspinatus (subtendinous) bursa?
Between the tendon of insertion of the infraspinatus m. and the caudal part of the greater tubercle of the humerus
Where is the intertubercular (subtendinous) bursa?
Deep to the biceps brachii tendon, between the greater and lesser tubercles of the humerus; inflammation can produce lameness
Where is the olecranon (subcutaneous) bursa?
Inconstant bursa deep to the skin over the olecranon; hygromatous enlargement is known as capped elbow
Where is the olecranon (subtendinous) bursa?
Located between the olecranon and the long head of the triceps brachii m.
Where is the precarpal (subcutaneous) bursa?
A false bursa that can develop on the dorsal surface of the carpus after repeated injury in trailer or small box stalls
Where is the bursa (subtendinous) of the common and lateral digital extensor tendons?
Lies between the cannon bone and the common and lateral digital extensor mm.
What is the perioplic corium?
Thin band of corium underlying the perioplic epidermis; germinal epithelium here produces the external and shiny periople; this layer is adjacent to the haired margin of the hoof capsule
What is the coronary corium?
Relatively broad band of dermis containing microscopic cones of connective tissue that are directed distally; germinal epithelium surfacing these cones produce the bulk of the hoof wall (stratum medium)
What is the laminar corium?
Parallel lamina of connective tissue directed from the deeper corium toward the wall; these lamina interlock with epithelial lamina of the hoof capsule; the germinal epithelium overlying the dermal lamina produce some of the hoof capsule
