Encloses jugular vein and vagus nerve

Encloses external carotid artery

Carotid sheath

The carotid sheath

A

Is attached superiorly to the base of the skull

B

Is fused with the pericardium inferiorly

C

Encloses the jugular vein

D

Lies deep to the prevertebral fascia

E

Contains the external carotid artery

Internal carotid artery

A

Enters the skull through the foramen lacerum

B

Divides into the anterior and middle cerebral arteries

C

Gives of the ophthalmic artery

D

Is accompanied within the skull by preganglionic sympathetic nerve fibres

E

Usually beings at the level of fourth cervical vertebra

Increased pressure within the carotid sinus results in

A

Reflex bradycardia

B

Decrease in sympathetic tone

C

Decrease in cardiac contractility

D

Reflex hyperpnea

E

Decrease in diameter of blood vessels

Increased pressure within the carotid sinus decreases

A

Sympathetic tone

B

Heart rate

C

Cardiac contractility

D

Pulmonary ventilation

E

Diameter of blood vessel

The schwann cell forms a myelin sheath around the

A

nodes of Ranvier

B

dendrites

C

nucleus

D

axon

In a cable immediately above metallic sheath ________ is provided.

A

Earthing connection

B

Bedding

C

Armouring

D

None of the above

The cause of damage to the lead sheath of a cable is

A

crystallisation of the lead through vibration

B

chemical action on the lead when buried in the earth

C

mechanical damage

D

all of the above

The metallic sheath may be made of lead or lead alloy or of aluminum.

A

Yes

B

No

When a bare thermocouple is covered by a protective sheath, the response becomes

A

Faster and oscillatory

B

Faster and non-oscillatory

C

Slower and oscillatory

D

Slower and non-oscillatory

Carotid sheath

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