Biology
* Carotid sheath, connective tissue around the neck's vascular compartment * Leaf sheath, the leaf base when it forms a vertical coating surrounding the stem * Myelin sheath, an insulating layer over the axon of a neuron * Preputial sheath, protective skin around the penis or clitoris ** Clitoral sheath ** Penile sheath, the foreskin into which a penis retracts * Rectus sheath, the laminas around abdominal muscles * Root sheath, the inner or epidermic coat around the root of a hair follicle * Tendon sheath, a synovial membrane surrounding a tendon in, for example, the fingersMedicine
* Introducer sheath is used to insert catheters and tools into blood vesselsSee also
* Sheaf (disambiguation) * Sheathing (disambiguation) * Sheave, a pulley used for holding a belt or rope {{disambiguation