Veterinary Gross Anatomy-II

Trapezius

MUSCLES OF PECTORAL GIRDLE - TRAPEZIUS

• It is a broad triangular muscle extending along the dorsal midline from the level of atlas to the end of the thoracic region, and covers a part of the shoulder. It consists of cervical (trapezius cervicis) and dorsal(trapezus thoracis) parts.
• Origin: Ligamentum nuchae and supraspinous ligament from the level of the atlas to the twelfth dorsal vertebra.
• Insertion: The tuberous part of the spine of the scapula and the scapular fascia.

• Action: To elevate the shoulder as a whole. The cervical part draws it forwards and the dorsal part backwards.
• Blood supply: Deep cervical, dorsal and intercostal arteries.
• Nerve supply: Spinal accessory nerve.