Sebaceous cysts are generally mobile masses filled with fibrous tissues, fluids, and/or a fatty, keratinous substance resembling cottage cheese. A "true" sebaceous cyst is filled with sebum and originates from sebaceous glands (whereas epidermoid cysts originate in the epidermis and pilar cysts originate from hair follicles, but the term "sebaceous cyst" is used to refer to both epidermoid and pilar cysts. Most cysts do not require treatment, but if the cyst grows and becomes painful or infected, it can be surgically removed. If the cyst is infected, antibiotics are used before or after the cyst is removed.
Although I don't entirely remember it, I think it's an extracellular matrix that surrounds the uppermost part of the papillary dermis and extends a few cells upward into the epidermis.
It functions to attach the epidermis securely to the dermis via connective tissue like collagen
The sarcoplasmic reticulum is a modified endoplasmic reticulum that stores, releases(during contraction), and retrieves(during relaxation) Ca++ ions. It surrounds the myofibrils just under the sarcolemma.
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