1. Functions of the bone
Bones do far more than provide rigidity. Their jobs fall into three groups: mechanical (protection, structure, movement, sound transduction), synthetic (blood production), and metabolic (mineral, fat, and growth storage, acid-base balance, detoxification, endocrine activity). Remember them with "Some Men Prefer Mini Skirts, But Can't Find Enough Skin."
2. Facial bones: "VAIN MM PLZ"
Textbooks disagree on which bones belong to the facial skeleton versus the neurocranium. The hyoid, ethmoid, and sphenoid are sometimes counted, sometimes assigned to the neurocranium, and some lists add frontal-aspect bones like the frontal bone. Use VAIN MM PLZ so you do not drop a facial bone. Standard anatomy references count 14 facial bones (StatPearls).
3. Cranial bones: "PEST OF"
The neurocranium is eight bones: occipital, two temporal, two parietal, sphenoid, ethmoid, and frontal. They form the major portions of the skull and protect the brain. The full skull totals 22 bones, 8 cranial and 14 facial (StatPearls).
4. Layers of the epidermis
The epidermis is the outermost layer of skin, itself built from a layer of epithelial cells. Epithelium more broadly covers and lines organs (digestive, respiratory, and so on). Recall the epidermal layers with "Come, Let's Get Sun Burned."
5. Functions of the epithelium: "PASSIFS"
Epithelium is one of the four basic animal tissue types, alongside connective, muscle, and nervous tissue. It lines hollow organs and glands and forms the body's outer surface. Cell structure varies by job: protective, secretory, or absorptive. Remember its functions with PASSIFS.
Frequently Asked Questions
How many bones are in the human skull?
The skull has 22 bones: 8 cranial bones that enclose and protect the brain and 14 facial bones that shape the face (StatPearls).
What is the mnemonic for the cranial bones?
"PEST OF" covers the eight cranial bones: parietal (2), ethmoid, sphenoid, temporal (2), occipital, and frontal. They form the major portions of the skull and protect the brain.
Why do mnemonics help in anatomy and physiology?
Anatomy and physiology is heavy on memorizing lists and structures that have no obvious logical order. A mnemonic gives that list a hook, so you can recall every item under pressure instead of dropping one. Use them for the bone groups, epidermal layers, and tissue functions.
What are the layers of the epidermis?
The mnemonic "Come, Let's Get Sun Burned" runs from the outermost layer inward: corneum, lucidum, granulosum, spinosum, and basale. The stratum lucidum appears only in the thick skin of the palms and soles.
What are the three groups of bone function?
Mechanical (protection, structure, movement, sound transduction), synthetic (blood cell production), and metabolic (mineral and fat storage, acid-base balance, and endocrine activity). Bones do far more than provide rigidity.