The sebaceous glands are found throughout the body, except the palms and soles, with particular abundance on the face and scalp. They are microscopic glands in the skin which secrete an oily/waxy matter called sebum which lubricates the skin and hair of animals.

Striated muscle is often referred to as skeletal muscle as it largely attaches to bones by bundles of collagen fibers known as tendons. It is made up of individual components called muscle fibers. The myofibers are made from long, multinucleated cells composed of actin and myosin myofibrils which...

The superior orbital fissure is a foramen in the skull which lies in between the lesser and greater wing of the sphenoid bone. Several important features pass through this, including: Oculomotor nerve- superior and inferior divisions (CN III) Trochlear nerve (CN IV) Ophthalmic nerve-...

The uveal tract is the pigmented middle of the three layers which make up the eye. It lies between the corneosclera and the retina and is made up of three sections; the iris, ciliary body and choroid

Trichromacy is where an organism has three types of colour receptors (cone cells) in its retina, with each having different absorption spectra. Organisms with trichromacy are called trichromats.

The zonule of Zinn is a ring of fibrous strands which connects the ciliary body with the lens of the eye. It is split into two layers; a thin layer which lines the hyaloid fossa and a thicker layer which is a collection of zonular fibers. Together, these form the suspensory ligament of the lens.