You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Axillary sheath is an extension of? and explain in detail?
ANSWER: (B) Prevertebral fasciaREF: Gray's anatomy 40th ed ch: 28, 46The axillary sheath is a fibrous sheath that encloses the first portion of the axillary artery, together with the axillaryvein andthebrachial plexus. It is an extension of the prevertebral layer of the deep cervical fasciaDeep fascia in the neck is organized into an investing layer, prevertebral fascia, and pretracheal fascia. The carotid sheath is a non-membranous layer of fascia that is conventionally described as part of the deep cervical fascia.