Miembro Pelviano Bovino - Anatomía & Fisiología

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Cintura Pélvica y Cadera

Huesos

La cintura pélvica está formada por dos huesos de la cadera que se unen ventralmente en la sínfisis pélvica cartilaginosa y se articulan dorsalmente con el sacro. Los tres componentes de cada hueso de la cadera son el ilion, pubis and isquion.

El hueso que se articula con los huesos de la cadera para formar la articulación de la cadera es el fémur.

Características del Hueso Bovino

• Ilion
  • En la vaca el tubérculo coxal es visible y fácilmente palpable.
  • El tubérculo sacro tiene dos prominencias, las espinas ilíacas dorsales craneal y caudal.
  • La cresta ilíaca' es delgada y cóncava.
  • El ala ilíaca está orientada de manera vertical.

• isquion
  • La tuberosidad isquiática es de forma triangular.

• Fémur
  • El trocánter mayor se extiende más dorsalmente en comparación con la cabeza femoral.
  • Las crestas del cóndilo medial y lateral son muy asimétricas con el borde medial, siendo más grandes.

Articulaciones y Estructuras Sinoviales

Articulación Sacroilíaca

• En ganado bovino la corta rama de los ligamentos sacroilíacos dorsales conecta la tuberosidad sacra a las apófisis espinosas del sacro.
• El ligamento sacrotuberoso es una amplia hoja ligamentosa, que se extiende entre la cara lateral del sacro y el borde dorsal del isquion y el ilion. En este ligamento están los agujeros isquiáticos menor y mayor, que están presentes para permitir el paso de vasos sanguíneos, nervios y tendones. El borde caudal de este ligamento es visible subcutáneamente.

Articulación Coxofemoral/de la Cadera

• La vaca tiene el rango más limitado de movimiento en comparación a otras especies domésticas en su cadera. Esto restringe principalmente la flexión y extensión y es el resultado de la conformación de su cabeza femoral, ligamentos intraarticulares y una gran masa muscular alrededor de la articulación.
• Los bóvidos también tienen una ranura acetabular adicional su cara craneoventral.

Musculatura

Los músculos que afectan a la cintura pélvica y la cadera se pueden dividir en dos grupos distintos:

• Musculatura de la Cintura
  • Psóas menor - el músculo está marcado por muchas intersecciones tendinosas
  • Iliac muscle - a fleshy muscle that is cross-sectionally flat cranially and round caudally. It originates from two heads; a strong lateral head from the wing of the ilium and a small medial one from the ileal shaft. They enclose the greater psoas and will unite to form a common tendon for insertion.
  • Quadrate Lumbar - a thin tendinous muscle whose origin is at the proximal end of the last rib and the transverse process of the cranial lumbar vertebrae. Its insertion is the transverse processes of the caudal lumbar vertebrae and the sacral wing.

• Rump Muscles
  • Superficial gluteal
    • It is totally fused with the biceps muscle of the thigh forming the gluteobiceps.
  • Middle Gluteal
    • Origin - the gluteal surface of the ilium. The muscle is flat at its origin and so the iliac crest is very palpable.
    • Insertion - The short portion inserts on the greater trochanter, the deep portion inserts on both the greater trochanter and distal and medial to it.
  • Deep Gluteal
    • Insertion - distal to the greater trochanter on the craniolateral aspect of the femur.
  • Tensor Muscle of the Fascia Lata
    • Origin - coxal tuberosity
    • Insertion - it joins the fascia lata and so indirectly attaches to the patella, lateral pattelar ligament and cranial border of the tibia. A caudodorsal detachment joins the superficial gluteal and so attaches to the greater trochanter.
  • Gluteobiceps
    • Origin - Vertebral head - caudal sacral vertebrae, sacrotuberous ligament and ischial tuberosity. Pelvic head - venterolateral aspect of the ischium from the ischiatic tuberosity to the obturator foramen.
    • Insertion - the two bellies unite and the redivide at mid-tibia level. The cranial belly attaches to the fascia lata and crural fascia and so inserts on the patella, the lateral patellar ligament and the tibial tuberosity. The cranial part forms the tarsal tendon and so inserts on the calcaneal tuberosity.
    • A synovial bursa exists between the tarsal tendon and lateral femoral condyle.
  • Semitendinous
    • Origin - caudoventral aspect of the ischial tuberosity.
    • Insertion - via a flat aponeurotic tendon to the cranial border of the proximal tibia, the crural fascia and the tendinous insertion of the gracilis muscle. An accessory tendon also inserts on the calcaneal tendon.
  • Semimembranous
    • Origin - it just has one from the pelvic head.
  • Sartorius
    • Origin - It is divided briefly into two heads because of the passage of femoral vessels.
  • External Obturator
    • Cattle have an extra intrapelvic part that originates from the ilial body, the pubis and ischium. This then inserts with the rest of the muscle on the trochantic fossa.

Proximal Hindlimb including Stifle and Tarsus

Bones

The bones immediately distal to the femur are the tibia, fibula, patella and some minor sesamoid bones. Some of these are involved in the stifle joint, weight-bearing and providing attachment for muscles.

Distal to these bones are the complex series of bones that make up the tarsus, these are the tarsal bones and metatarsals.

Bovine Bone Specifics

• Patella
  • The patella is extended medially by fibrocartilage.

• Tibia
  • The lateral aspect of the condyle has no articular facet as the fibula is directly fused to the tibia at this point.
  • The lateral aspect of the cochlea has an articular facet as the malleolar bone, the remnant of the distal fibula, articulates here.

• Fibula
  • The shaft of the fibula is totally absent.
  • The proximal head is fused to the tibia.
  • The distal part remains as the malleolar bone, which articulates with the tibia.

• Talus
  • The trochlear ridges lie in a sagittal direction and articulates with the medial malleolus medially and the mlleolar bone laterally.
  • The distal trochlear is well defined, articulating with the combined 4th and central tarsal bones.

• Calcaneus
  • The calcaneal tuberosity's proximal aspect is roughened and hollowed out.

• Distal Row of Tarsal Bones
  • The cow only has three bones in the distal row, with the 1st tarsal bone being the only one left unfused. The 2nd and 3rd tarsal bones are fused together. The central and 4th tarsal bones are also fused.

Joints and Synovial Structures

Stifle Joint

• Like the horse the cow has three patellar ligaments; the middle patellar ligament, the lateral patellar ligament and the medial patellar ligament.
• The middle patellar ligament connects the the cranial aspect of the patella apex to the tibial tuberosity. It has one associated bursae; one between the ligament and the groove on the tibial tuberosity. It is palpable just proximal to the tibial plateau.
• The medial patellar ligament connects the parapatellar fibrocartilage to the medial aspect of the tibial tuberosity.
• The lateral patellar ligament the cranio-lateral aspect of the patella to the lateral aspect of the tibial tuberosity.
• The medial and lateral femorotibial joint capsules communicate and the medial femorotibial communicates with the femoropatellar.

Tarsal Joint/Hock

• The cow has some degree of flexion and extension in its proximal intertarsal joint.
• Like the dog the cow has an extra branch to its short medial collateral ligament that extends to the medial metatarsal bones.

Musculature

Muscles of the Stifle

Muscles of the Bovine Crus

Vasculature of the Hindlimb

Arteries of the Hindlimb

• The essential difference between the bovine arterial system of the hindlimb and that of the dog is the supply to the distal hindlimb.
• Unlike horses and dogs the saphenous artery doesn't have cranial and caudal branches. Instead it continues down the plantar aspect of the foot and splits into the medial and lateral plantar digital arteries.
• The dorsal metatarsal artery III sits in the groove between metatarsal III andd IV and becomes the dorsal common digital artery III near the fetlock.
• An interdigital artery exists that connects the dorsal common digital artery III and the plantar common digital artery III by passing through the interdigital space.
• There are axial and abaxial digits that run on their respective sides of the digits.

Veins of the Hindlimb

Lymphatics of the Hindlimb

Este artículo ha sido traducido de Inglés por 'Beatriz Salmerón Samerón' - 16.09.2011.