Superior sagittal sinus continues as:

 # Superior sagittal sinus continues as:

A. Inferior sagittal sinus

B. Straight sinus

C. Right transverse sinus

D. Left transverse sinus

The correct answer is C. Right transverse sinus.

Superior sagittal sinus continues as right transverse sinus. Inferior sagittal sinus ---> Straight sinus. 

Straight sinus ---> Left transverse sinus. 

Transverse sinus -----> Sigmoid sinus

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Cricothyroid muscle is supplied by:

 # Cricothyroid muscle is supplied by:

A. External laryngeal nerve

B. Internal laryngeal nerve

C. Recurrent laryngeal nerve

D. A direct branch from vagus nerve

The correct answer is A. External laryngeal nerve. 

All the muscles of  larynx are supplied by recurrent laryngeal nerve EXCEPT Cricothyroid. Cricothyroid is supplied by External laryngeal nerve. Recurrent laryngeal nerve supplies:

a) All intrinsic muscles of larynx EXCEPT Cricothyroid

b) Sensory nerves to the larynx below the level of the vocal cords.

c) Cardiac branches to the deep cardiac plexus.

d) Branches to the trachea and oesophagus.

e) Inferior constrictor

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The space between the vocal folds is called:

 # The space between the vocal folds is called as:

A. Rima vestibuli

B. Rima glottidis

C. Rima laryngeus

D. Rima arytenoid

The correct answer is B. Rima glottidis.

Within the cavity of larynx there are two folds of the mucus membrane on each side. The upper fold is the vestibular fold and the lower fold is the vocal fold. 

The space between the right and left vestibular folds is the rima vestibuli; and the space between the vocal folds is the rima glottidis. 

The vestibular and vocal folds divide the cavity of the larynx into three parts: 

1. The part above the vestibular fold is called the vestibule of the larynx.

2. The part between the vestibular and vocal folds is called the sinus or ventricle of the larynx. 

3. The part below the vocal folds is called the infraglottic part. 

The sinus of Morgagni or ventricle of the larynx is a narrow fusiform cleft between the vestibular and vocal folds. The anterior part of the sinus is prolonged upwards as a diverticulum between the vestibular fold and the lamina of the thyroid cartilage. This extension is known as the saccule of the larynx. The saccule contains mucous glands which help to lubricate the vocal folds. 

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The tympanic membrane is supplied by the following nerves EXCEPT:

 # The tympanic membrane is supplied by the following nerves EXCEPT :

A. Auriculotemporal

B. Vagus

C. Glossopharyngeal

D. Chorda tympani

The correct answer is D. Chorda tympani.

The tympanic membrane is a thin, translucent partition between external acoustic meatus and the middle ear. It forms an obtuse angle with the floor of the external auditory meatus. It is oval in shape and measures 9*10 mm. It is placed obliquely at an angle of 55 degrees with the floor of the meatus. It faces downwards, forwards and laterally. The inner surface is convex. Its outer surface is concave. The inner surface provides attachment to handle of the malleus which extends upto its center. The point of maximum convexity lies at the tip of the handle of the malleus and is called the umbo. 

The outer surface of the tympanic membrane is supplied by the auriculotemporal nerve and the auricular branch of the vagus. The inner surface is supplied by the glossopharyngeal nerve through the tympanic plexus. 

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