文档介绍：1SS
Pictorial Essay
Differential Diagnosis of Head and Neck Lesions Based on
Their Space of Origin. 2. The lnfrahyoid Portion of the Neck
Wendy R. K. Smoker1’2 and H. Ric Harnsberger1
The infrahyoid portion of the neck can be considered as a skull base to the upper mediastinum, forming the anterior wall
series of contiguous fascial planes and intervening spaces that of the retropharyngeal space and contributing to formation of
lend themselves well to axial imaging. These spaces can serve the carotid sheath.
as a basis on which to formulate differential diagnoses for dis- The deep layer of the deep cervical fascia encircles the
eases in this region. This pictorial essay describes the fascia and
paraspinous and prevertebral muscles and associated struc-
fascial spaces of the infrahyoid portion of the neck. The contents
of each space, mon abnormalities affecting the space,
and the characteristic displacements produced by disease in
each space are reviewed.
Anatomy
The two major fascial layers of the infrahyoid neck are the
superficial and deep cervical fasciae. The more important
deep cervical prises three distinct layers, the su-
perficial, middle, and deep layers, and cleaves the infrahyoid
portion of the neck into a number of fascial spaces [1].
Completely surrounding the neck, the superficial layer of
deep cervical fascia lies deep to the skin and su