Anatomy embryology histology videos & books

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Correct Answer-C The cranial root of the accessory nerve is smaller than the spinal root. It exits the skull through the jugular foramen and unites for a short distance with the spinal root. Its fibers innervate the pharyngeal and palatal muscles, except tensor veli palatini. Because the cranial part of accessory nerve (CN XI) leaves the jugular foramen as joining the CN X, it is sometimes considered part of the plexus as well The tensor veli palatini is supplied by the medial pterygoid nerve, a branch of mandibular nerve, the third branch of the trigeminal nerve - the only muscle of the palate not innervated by the pharyngeal plexus

Correct Answer- A Uvula vesicae is a small elevation situated immediately behind the urethral orifice, which is produced by the underlying median lobe of the prostate. It enlarges with age due to enlargement of the underlying median lobe of the prostate and may inhibit complete bladder emptying.

Correct Answer - C • Circumcaval (retrocaval) ureter results from altered vasculature rather than ureteral development. Thus, preureteral vena-cava is more appropriate term. • This disorder involves right ureter which passes behind IVC winding about and crosses in front of it from medial to lateral direction. The anomaly is divided into two types :? 1) Type 1 : It is more common and has hydronephrosis with a typically obstructing pattern demonstrating some degree of fish-hook shaped deformity of ureter. 2) Type 2 : It has lesser degree of hydronephrosis or not at all.

Correct Answer-C Ans. is 'c' i.e., Anterior mediastinum • Esophagus mainly descends in superior and posterior mediastinum • Esophagus is usually not a content of middle mediastinum, but it forms posterior boundry of middle mediastinum (BDC Vol.-1, 6`"/e p. 246). • Esophagus has no relation to anterior mediastinum. Thus, among the given options, best answer is anterior mediastinum

Correct Answer - B Ans. is 'b'i.e., Anterior wall • The middle ear is shaped like a cube • When seen in the coronal section, the cavity of the middle ear is biconcave. • The boundaries of the middle ear are as follows : 1. Roof or tegmental wall • Separates the middle ear from the middle cranial cavity. • It is formed by a thin plate of bone called tegmen tympani. 2. Floor or jugular wall • Formed by a thin plate of bone which separates the middle ear from the superior bulb of the internal jugular vein • The floor also presents the tympanic canaliculus which transmits the tympanic branch of the glossopharyngeal nerve 3. Anterior or carotid wall • The uppermost part bears the opening of the canal of the tensor tympani. • The middle part has the opening of the auditory tube. • The inferior part of the wall is formed by a thin plate of bone which forms the posterior wall of the carotid canal. This plate separates the middle ear from the internal carotid artery. 4. Posterior or mastoid wall

In posterior dislocation of shoulder there is internal rotation of humeral head. ◦ Hence, in the AP film, the shape of humeral head appears like that of Electric bulb called as 'light bulb sign.'

Correct Answer -C Ans. is 'c' i.e., Ventral rami of thoracic spinal nerves Ventral rami of upper 11th thoracic spinal nerves are known as intercostal nerves and ventral ramus of T12 is known as subcostal nerve. Upper six intercostal nerves supply thoracic wall whereas lower five intercostal nerves and subcostal nerve supply thoracic and anterior abdominal walls and hence known as thoracoabdominal nerves. Upper two intercostal nerves also supply the upper limb. Thus only 3rd to 6th are called typical intercostal nerves.