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The left common carotid varies in its origin more than the right. In the majority of abnormal cases it arises with the brachiocephalic trunk; if that artery is absent, the two carotids arise usually by a single trunk. It is rarely joined with the left subclavian artery, except in cases of transposition of the aortic arch.
Auricular branch: supplies the back of the ear. In many specimens, this branch gives rise to the mastoid branch, which supplies the dura mater, diploe, and mastoid air cells. In other specimens, the mastoid artery is a branch of the occipital artery, rather than the auricular branch.
The head and neck are emptied of blood by the subclavian vein and jugular vein. Right side of neck dissection showing the brachiocephalic, right common carotid artery and its branches. The brachiocephalic artery or trunk is the first and largest artery that branches to form the right common carotid artery and the right subclavian artery. This ...
Carotid artery dissection is a serious condition in which a tear forms in one of the two main carotid arteries in the neck, allowing blood to enter the artery wall and separate its layers (*dissection*). This separation can lead to the formation of a blood clot, narrowing of the artery, and restricted blood flow to the brain, potentially ...
Ear pain due to an infection is the most common in children and can occur in babies. [10] Adults may need further evaluation if they have hearing loss, dizziness or ringing in the ear. [6] Additional red flags include diabetes, a weakened immune system, swelling seen on the outer ear, or swelling along the jaw. [12]
The ear canal (external acoustic meatus, external auditory meatus, EAM) is a pathway running from the outer ear to the middle ear.The adult human ear canal extends from the auricle to the eardrum and is about 2.5 centimetres (1 in) in length and 0.7 centimetres (0.3 in) in diameter.
Left external carotid artery with normal spectral doppler ultrasound. The condition and health of the external carotid arteries is usually evaluated using Doppler ultrasound, CT angiogram or phase contrast magnetic resonance imaging (PC-MRI). Typically, blood flow velocities in the external carotid artery are measured as peak systolic velocity ...
It often presents with ear pain, swelling of the ear canal, and occasionally decreased hearing. [2] Typically there is pain with movement of the outer ear. [3] A high fever is typically not present except in severe cases. [3] Otitis externa may be acute (lasting less than six weeks) or chronic (lasting more than three months). [2]