Sweat glands contain several types of tissue, working together to produce and secrete sweat. The primary tissue type is epithelial tissue, specifically found in the secretory portion and ducts of the glands. This epithelial tissue can vary in type, being described as simple squamous, simple cuboidal, or low columnar depending on the location and type of sweat gland (apocrine or eccrine). See: Histomorphometrical Study on Regional Variation in Distribution of ... The excretory ducts of sweat glands also contain this epithelial tissue. See: Epithelium: What It Is, Function & Types
Additionally, sweat glands are surrounded by adipose tissue. [See: Structure. Generally, sweat glands consist of a secretory unit that produces sweat, and a duct that carries the sweat away. The secretory coil or base, is set deep in the lower dermis and hypodermis, and the entire gland is surrounded by adipose tissue.] The dermis, where many sweat glands reside, is composed of connective tissue and contains blood vessels, nerve endings, and hair follicles. See: Histology, Dermis - StatPearls - NCBI Bookshelf
In summary, while epithelial tissue forms the functional core of the sweat gland, adipose and connective tissues are also vital components of the sweat gland's structure and surrounding environment.
