Anatomy embryology histology videos & books

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.

Correct Answer - D Ans. is 'd' i.e., Lesser omentum

Correct Answer -C C i.e. subluxation of proximal radio ulnar joint . If a young child is lifted by the wrist, the head of the radius may be pulled partly out of the annular ligament, i.e., subluxation of the head of the radius. It occurs when forearm is pronated, elbow is extended and longitudinal traction is applied to the hand or wrist, e.g., lifting, spinning or swinging a child with wrist or hand. Pulled elbow most commonly occurs between the age of 2-5 years

Correct Answer-B The pterygopalatine fossa is the region between the pterygomaxillary fissure and the nasal cavity * The fossa accommodates branches of the maxillary nerve [cranial nerve (CN) V-2], the pterygopalatine ganglion, the terminal branches of the maxillary artery, and greater superficial petrosal nerve.

Correct Answer - B Ans:B. Calf Calf Aorta and Common liac- Buttocks Femoral Artery- Thigh Superficial femoral artery⁃ Calf and popliteal artery Posterior tibial Artery- Feet BDC 7th edition, volume 2, page no 137.