The lymph nodes draining the head and neck are classified into superficial and deep nodes. Superficial lymphatics follow superficial veins while deep lymphatics follow arteries. I. Superficial Nodes: Drain superficial tissues of head and neck. A. Circular Group: Arranged in the form of a circle round the neck called "Pericervical collar". It includes: (a) Submental Nodes: Lie in submental triangle. [...]
Ethmoid bone lies between two orbital cavities, cuboidal in shape. It takes part in the formation of orbit, anterior cranial fossa, roof, lateral wall and septum of nose. Parts: It has three parts: 1. Cribriform plate, 2. Perpendicular plate and 3. Labyrinthine part. At the time of birth bone has three pieces- median plate, right and left labyrinths. 1. Cribriform [...]
In this article we will discuss about the various parts of sphenoid bone which belongs to human skull. It resembles a bat or butterfly with outstretched wings. It takes part in the formation of orbit, middle cranial fossa, infra temporal, temporal and pterygopalatine fossae. It is a pneumatic bone - containing sphenoidal air sinus in its body. Parts of the [...]