Pectoral muscles

Pectoral muscles refers to either of the muscles that connect the front walls of the chest with the bones of the upper arm and shoulder:

In sports as well as bodybuilding, the pectoral muscles may colloquially be referred to as "pecs".

Cat anatomy

The anatomy of the domestic cat is similar to that of other members of the genus Felis.

Mouth

Cats have highly specialized teeth for the killing of prey and the tearing of meat. The premolar and first molar, together the carnassial pair are located on each side of the mouth. These teeth efficiently function to shear meat like a pair of scissors. While this is present in canids, it is highly developed in felines.

The cat's tongue has sharp spines, or papillae, useful for retaining and ripping flesh from a carcass. These papillae are small backward-facing hooks that contain keratin which also assist in their groom.

The cat's oral structures provide for a variety of vocalizations used for communication, including meowing, purring, hissing, growling, squeaking, chirping, clicking, and grunting.

Ears

Thirty-two individual muscles in each ear allow for a manner of directional hearing; a cat can move each ear independently of the other. Because of this mobility, a cat can move its body in one direction and point its ears in another direction. Most cats have straight ears pointing upward. Unlike dogs, flap-eared breeds are extremely rare (Scottish Folds are one such exceptional mutation). When angry or frightened, a cat will lay back its ears to accompany the growling or hissing sounds it makes. Cats also turn their ears back when they are playing or to listen to a sound coming from behind them.