Posterior pituitary Definition It is a section of the endocrine system that comprises of the posterior lobe of the pituitary gland. It is also known by the name “neurohypophysis.”

Thoracic Splanchnic Nerves Definition They refer to the splanchnic nerves which arise from the particular thoracic segment of the sympathetic nerves and pass inferiorly to supply sympathetic innervations to the abdomen. Such splanchnic nerves include visceral afferent and preganlionic sympathetic fibres.

Pyramidal Lobe of Thyroid Gland Definition It refers to the cone-shaped third lobe of the thyroid gland, which frequently arises from the upper border of the isthmus and sometimes from the adjoining part of either lobe. Sometimes, it stretches till the hyoid bone and marks its point of stability with the thyroglossal duct. Occasionally, it [...]

Pars distalis Definition It refers to a section of the anterior lobe of the master gland of the endocrine system – the pituitary gland (hypophysis), which is situated at the base of the brain. In Latin, the structure is known as “Pars tuberalis adenohypophyseos.” Pars distalis Anatomy This is the largest as well as the most [...]

Pars tuberalis Definition It refers to a pair of processes that grow in an upward or forward along the stem of the adenohypohysis. It is a part of the anterior lobe of the human pituitary gland.

Thyroid isthmus Definition It is the middle section of the thyroid gland.  In Latin, it is known as Isthmus Glandulae Thyroidea. Thyroid isthmus Anatomy The structure measures around 1.25 cm in depth and the same in breadth. However, its dimensions and location can vary. It is covered by the fascia and the skin in the [...]

What is Pars intermedia? It is the section of the pituitary gland that is located in the brains of vertebrates. It forms a boundary between the posterior and the anterior sections of the gland.

Zona glomerulosa Definition It is the outermost level of the adrenal cortex or the cortex of the suprarenal gland. The other two layers of the adrenal cortex beneath the glomerulosa are Zona fasciculata and Zona reticularis. Zona glomerulosa Location It lies directly under the capsule of the adrenal gland. Zona glomerulosa Appearance It is narrow [...]

Zona reticularis Definition It is the innermost of the three tissue layers of the cortex in the adrenal gland. It comprises of cylindrical masses of epithelial cells that are arranged in an irregular, netlike fashion. The other two adrenal cortex layers, lying above this layer, are Zona glomerulosa and Zona fasciculata. Zona reticularis Location It [...]