Head and Neck

Internal Carotid Artery

Internal Carotid Artery The structure indicated is the internal carotid artery. The internal carotid arteries arise from the common carotid arteries. The brachiocephalic artery arises from the arch of the aorta and divides into the right subclavian artery and the right common carotid artery. There is no left brachiocephalic artery however, and the left common carotid arises directly from the aortic arch. There are three branches which come off the aortic arch: Brachiocephalic artery Left common carotid Left subclavian The common carotid arteries then divide into the external carotid and internal carotid arteries. The internal carotid artery ascends to supply the …

Internal Carotid Artery Read More »

internal carotid artery

Superior Sagittal Sinus

Superior Sagittal Sinus The structure indicated is the superior sagittal sinus. The brain is drained by a series of veins and venous channels which drain into large dural venous sinuses, which in turn ultimately drain to the internal jugular veins. The dural venous sinuses are lined by endothelium and located between the layers of the dura mater in the brain. The venous sinuses are different to other blood vessels as they do not have the same set of layers which form their walls, and do not contain valves, like veins. The venous sinuses receive blood from veins which drain the …

Superior Sagittal Sinus Read More »

Superior Sagittal Sinus

Major alar cartilage

Major alar cartilage The structure indicated is the major alar cartilage (greater alar cartilage). The lateral walls of the external nose are comprised from three cartilages: Lateral process of septal cartilage Major alar cartilage Minor alar cartilage The major alar cartilage is located directly below the lateral process of the septal cartilage. It is structured such that it is bent in on itself to form both the medial and lateral walls of the nose. The crus laterale forms the lateral wall, whereas the crus mediale forms the medial wall.
Major Alar Cartilage

Precentral Gyrus

Precentral Gyrus The structure indicated is the precentral gyrus. A gyrus is a ridge on the cerebral cortex, and is usually surrounded by grooves, known as sulci. Fissures are larger than sulci and divide the brain into lobes, as well as dividing the brain into right and left hemispheres. The sulci anterior to the precentral gyrus is known as the precentral sulcus. This sulcus lies parallel to the central sulcus (also referred to as the fissure of Rolando/Rolandic fissure). The central sulcus separates the parietal lobe from the frontal lobe. The precentral gyrus contains the primary somatomotor cortex. Learn more …

Precentral Gyrus Read More »

Precentral Gyrus