Midterm Study Guide
Anatomy and Physiology
BIOS 252
BIOS 252 Anatomy and Physiology II – Midterm
Study Guide
Description:
Comprehensive study guide for the BIOS 252 Anatomy and Physiology II midterm exam. Includes
detailed summaries of key chapters, body systems, and essential concepts such as the cardiovascular,
lymphatic, respiratory, digestive, and urinary systems. Organized for easy review with definitions,
diagrams, and key term explanations. Perfect for quick revision or in-depth exam preparation.
Tags: BIOS 252, Anatomy and Physiology II, Midterm Exam, Study Guide, College Notes, A&P,
Exam Prep
Chapter 12
A. Types of myelinated fibers
• Axis cylinder forms the central core of the fiber. It consists of axoplasm covered
by axolemma.
• Myelin sheath derived from Schwann cells, surrounds the axis cylinder.
• Neurolemmal sheath (sheath of Schwann) surrounds the myelin sheath. It
represents the plasma membrane (basal lamina) of the Schwann cell.
• Neurolemmal sheath is necessary for regeneration of a damaged nerve.
• Endoneurium is a delicate connective tissue sheath which surrounds the
neurolemmal sheath.
A. Types of unmyelinated fibers
• smaller axons of the CNS, in addition to peripheral postganglionic autonomic
fibers (C fibers of skin, muscle and viscera), olfactory nerves. Non-myelinated
fiber consists of a group of small axons that have invaginated separately a single
Schwann cell.
1
Anatomy and Physiology
BIOS 252
BIOS 252 Anatomy and Physiology II – Midterm
Study Guide
Description:
Comprehensive study guide for the BIOS 252 Anatomy and Physiology II midterm exam. Includes
detailed summaries of key chapters, body systems, and essential concepts such as the cardiovascular,
lymphatic, respiratory, digestive, and urinary systems. Organized for easy review with definitions,
diagrams, and key term explanations. Perfect for quick revision or in-depth exam preparation.
Tags: BIOS 252, Anatomy and Physiology II, Midterm Exam, Study Guide, College Notes, A&P,
Exam Prep
Chapter 12
A. Types of myelinated fibers
• Axis cylinder forms the central core of the fiber. It consists of axoplasm covered
by axolemma.
• Myelin sheath derived from Schwann cells, surrounds the axis cylinder.
• Neurolemmal sheath (sheath of Schwann) surrounds the myelin sheath. It
represents the plasma membrane (basal lamina) of the Schwann cell.
• Neurolemmal sheath is necessary for regeneration of a damaged nerve.
• Endoneurium is a delicate connective tissue sheath which surrounds the
neurolemmal sheath.
A. Types of unmyelinated fibers
• smaller axons of the CNS, in addition to peripheral postganglionic autonomic
fibers (C fibers of skin, muscle and viscera), olfactory nerves. Non-myelinated
fiber consists of a group of small axons that have invaginated separately a single
Schwann cell.
1
