Stellate ganglion is located:-
**Core Concept**
The stellate ganglion is a paravertebral sympathetic ganglion located in the neck, formed by the fusion of the inferior cervical ganglion and the first thoracic ganglion. It plays a crucial role in regulating sympathetic outflow to the head, neck, and upper extremities.
**Why the Correct Answer is Right**
The stellate ganglion is situated in the posterior triangle of the neck, anterior to the transverse process of the seventh cervical vertebra (C7) and the first thoracic vertebra (T1). This location allows it to innervate the sympathetic nerves that supply the head and neck, including the carotid body, carotid sinus, and the nerves that control sweat glands in the head and neck. The stellate ganglion is also involved in the sympathetic innervation of the upper limb, particularly the radial and ulnar nerves.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the stellate ganglion is not located in the axilla.
**Option B:** This option is incorrect because the stellate ganglion is not located in the thoracic cavity.
**Option C:** This option is incorrect because the stellate ganglion is not located in the lumbar region.
**Clinical Pearl / High-Yield Fact**
The stellate ganglion block is a procedure used to diagnose and treat a variety of conditions, including complex regional pain syndrome, sympathetic dystrophy, and certain types of headaches.
**Correct Answer: C. It is located in the posterior triangle of the neck, anterior to the transverse process of the seventh cervical vertebra (C7) and the first thoracic vertebra (T1).**