How does the human trapezius muscle differ from the cats?
1) Human: “In human anatomy, the trapezius is a large superficial muscle which extends longitudinally from the occipital bone to the lower thoracic vertebrae, and laterally to the spine of the scapula (shoulder blade). The trapezius has 3 functional regions: The superior region (descending part) supports the weight of the upper limb. The intermediate region (transverse part) retracts the scapulae. The inferior region (ascending part) medially rotates and depresses the scapulae. . It is innervated by the accessory nerve (Cranial Nerve 11) and the ventral rami of third (C3) and fourth (C4) cervical spinal nerves, which also supplies the sternocleidomastoid muscle. The two trapezius muscles together resemble a trapezium, or diamond-shaped quadrilateral; the 4 points of the diamond are: the head (at the occipital protuberance), the two shoulders, and the middle of the back (at the spinous process of the twelfth thoracic vertebra, T12).” Source and further information:
