Anatomy is the branch of biology concerned with the study of the structure of organisms and their parts.Anatomy is inherently tied to embryology, comparative anatomy, evolutionary biology, and phylogeny, as these are the processes by which anatomy is generated over immediate (embryology) and long (evolution) timescales.
Human anatomy is one of the basic essential sciences of medicine.
The discipline of anatomy is divided into macroscopic and microscopic anatomy.
Mammals have three bones in the middle ear and a cochlea in the inner ear.
They are clothed in hair and their skin contains glands which secrete sweat.
Methods have also improved dramatically, advancing from the examination of animals by dissection of carcasses and cadavers (corpses) to 20th century medical imaging techniques including X-ray, ultrasound, and magnetic resonance imaging.
Anatomy and physiology, which study (respectively) the structure and function of organisms and their parts, make a natural pair of related disciplines, and they are often studied together.
They have a bony skeleton, are generally laterally flattened, have five pairs of gills protected by an operculum, and a mouth at or near the tip of the snout. Bony fish have a swim bladder which helps them maintain a constant depth in the water column, but not a cloaca.
They mostly spawn a large number of small eggs with little yolk which they broadcast into the water column Mammals are a diverse class of animals, mostly terrestrial but some are aquatic and others have evolved flapping or gliding flight.
It contracts slowly but maintains contractibility over a wide range of stretch lengths.
It is found in such organs as sea anemone tentacles and the body wall of sea cucumbers.
They mostly have four limbs but some aquatic mammals have no limbs or limbs modified into fins and the forelimbs of bats are modified into wings.