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A gradual occlusion will allow an anastamoses to form in time to bypass any blockage. But if sudden occlusion occurs then the area supplied by the occluded artery is compromised and therefore die.

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Which ever coronary artery R or L gives rise to the posterior interventricular artery, determines if the heart is R or L dominant.

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arises from the R aortic sinus coursing in the R atriovenricular groove. embedded in the fat around the auricles.

This supplies the SA node, most of the right ventricle part of the left ventricle via the posterior interventricular artery, the posterior 1/3 of the interventricular septum and the AV node.
other branches include the right marginal branch.

L coronary artery:

Supplies the L atrium, most of L ventricle by the marginal and LAD branches, part of the R ventricle by the LAD branch , Anterior 2/3rd of the interventricular branch via the LAD branch , the AV node and bundle, and the SA node.

has the LAD branch heading to the apex of the heart
another branch is the circumflex branch which gives rise to the L marginal branch.

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Role: protects and guards the airways.

Located between the levels of C3-C6 vertebral bodies.

allows the production of speech

Also connects the inferior part of the pharynx to the trachea.

Epiglottis: heart shaped elastic cartilage engages in the process of swallowing and closes the larynx when swallowing.
Thyroid cartilage: lies opposite to the C4 vertebrae. Is also an incomplete ring.
The Arytenoid cartilages are connected to the thyroid cartilage by ligaments. those pivot, abduct and adduct the vocal cords to produce sound.

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Nasal conchae and corresponding meatuses

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Nasal conchae and corresponding meatuses

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Includes the superior, middle and inferior conchae.

Superior conchae will drain fluids of the nose into the superior meatus which connects to the sphenoid sinus.

The middle conchae drains into the middle meatus which connects to both the frontal sinus and maxillary sinus.

the inferior choncae drains into the inferior meatus connecting to the nasolacrimal duct.

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Those are under voluntary control.
Those include the external muscles - circular shape and are known as constrictors with superior , middle and inferior layers.

The internal muscle layer has muscles in a longitudinal orientation which have 3 parts attached to different points. Those muscles shorten to elevate the pharynx

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Superiorly: extends from the base of the cranium
Anterioinferiorly: inferior border of the cricoid cartilage
Extends posteroinferiorly to the border of C6
It also extends inferiorly past the larynx

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Sits behind the nasal, oral cavities. functions to direct food from the mouth to the oesophagus.