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Ear Anatomy – Outer Ear. The medical term for the outer ear is the auricle or pinna. The outer ear is made up of cartilage and skin. There are three different parts to the outer ear; the tragus, helix and the lobule. EAR CANAL The ear canal starts at the outer ear and ends at the ear drum. The canal is approximately an inch in length.

It’s a hollow tube that curves slightly downward as it moves into the ear toward the tympanic membrane, or eardrum. The eardrum is the ending point of the outer ear and the beginning of the middle ear The outer ear lies directly next to the middle ear. Though mostly made of cartilage and skin, the outer ear arises from the temporal bone.

Within these structures lies the orifice known as the external acoustic meatus, which is the entrance to the middle and inner ear. Middle Ear. The tympanic membrane is the border between the external acoustic meatus of the outer ear and the middle ear.

External Ear Anatomy Image Diagram - Chart - diagrams and charts with labels. This diagram depicts External Ear Anatomy Image

External iliac vessels and their branches in a cadaver: The external iliac artery originates from the common iliac artery. Arteries have thick, muscular walls, hence they have a firmer consistency compared to veins. The inferior epigastric artery branches from the external iliac artery just posterior to the inguinal ligament.

The external iliac lymph nodes can be found surrounding the external iliac artery and act as the draining nodes for several regions of the pelvis and lower limb.

In the abdomen, the aorta splits into the right and left common iliac arteries. At the pelvic brim, each common iliac artery splits into the internal and external iliac arteries. Each external iliac artery courses downward and laterally, turning into the femoral artery, which supplies each leg.

External Iliac Image Diagram - Chart - diagrams and charts with labels. This diagram depicts External Iliac Image