Louisville Beauty Academy (LBA), The College of Human Service of Di Tran University, proudly shares Chapter X of THE COMPLETE NAIL LICENSING MASTER BOOK — 2025 Edition.
As part of our mission to humanize education and remove fear from the licensing process, we are releasing all 50 chapters online for free for students, schools, ESL learners, and future beauty professionals across the nation.
Each chapter is part of the most comprehensive nail licensing textbook ever created, designed specifically for State Board Theory & Practical and built on our core philosophies:
YES I CAN™ (courage, confidence) and
I HAVE DONE IT™ (achievement, professionalism).
Louisville Beauty Academy continues to adapt and adopt at light speed, providing not only this complete textbook but also upcoming videos, visual guides, and step-by-step practical demonstrations, all aimed at ensuring every learner feels supported and empowered.
LBA is proud to serve as a true YES I CAN™ institution and a Center of Excellence in beauty education.
CHAPTER 19 — ANATOMY & PHYSIOLOGY (Nails, Skin, Hands, Feet)
Louisville Beauty Academy (LBA) — YES I CAN™ Understand the Human Body to Perform Safe, Loving, Professional Services
Understanding anatomy helps nail technicians:
- work safely
- avoid pain or injury to clients
- understand nail growth
- prevent damage
- increase precision
- pass the licensing exam
Louisville Beauty Academy teaches:
“Anatomy is the map.
Safety is the destination.
Love is the purpose.”
🔑 SECTION A — NAIL ANATOMY
(ESL-friendly, simple terms, high exam importance)
1. Nail Plate
Meaning: The visible nail, made of keratin.
Sentence: “The nail plate has no nerves—filing here does not hurt.”
LBA Tip: What you see.
2. Free Edge
Meaning: Part of nail that extends beyond finger/toe.
Sentence: “We shape the free edge during manicure.”
LBA Tip: Edge we file.
3. Nail Bed
Meaning: Skin under the nail plate.
Sentence: “Damage to nail bed causes pain.”
LBA Tip: Sensitive area.
4. Matrix (Nail Root)
Meaning: Where nail is formed; controls nail growth.
Sentence: “Injuring the matrix can permanently change nail shape.”
LBA Tip: Growth factory.
5. Lunula
Meaning: White crescent-shaped area near base of nail.
Sentence: “The lunula is part of the matrix.”
LBA Tip: Little moon.
6. Cuticle
Meaning: Dead skin on nail plate that must be removed.
Sentence: “We gently remove cuticle for better adhesion.”
LBA Tip: Dead skin only.
7. Eponychium
Meaning: Living skin at base of nail.
Sentence: “We NEVER cut the eponychium.”
LBA Tip: Living skin—don’t cut.
8. Hyponychium
Meaning: Skin under free edge.
Sentence: “Filing too deep can injure the hyponychium.”
LBA Tip: Under-nail skin.
9. Nail Folds
Meaning: Skin surrounding sides of nail.
Sentence: “We avoid flooding nail folds with polish.”
LBA Tip: Side walls.
10. Perionychium
Meaning: Skin around the nail.
Sentence: “Keep perionychium clean to avoid lifting.”
LBA Tip: Surrounding area.
🔑 SECTION B — SKIN ANATOMY
(3-layer structure, simple & essential)
1. Epidermis
Meaning: Outermost layer.
Sentence: “The epidermis is where hangnails occur.”
LBA Tip: Top layer.
2. Dermis
Meaning: Middle layer with nerves & blood vessels.
Sentence: “Pain comes from the dermis, not the nail plate.”
LBA Tip: Feeling layer.
3. Subcutaneous Layer
Meaning: Bottom layer with fat for cushioning.
Sentence: “Protects bones from pressure.”
LBA Tip: Protective layer.
4. Keratin
Meaning: Protein forming nails, hair, outer skin.
Sentence: “Nails are made of hard keratin.”
LBA Tip: Protein power.
5. Melanin
Meaning: Pigment giving skin its color.
Sentence: “Dark spots come from melanin.”
LBA Tip: Skin pigment.
🔑 SECTION C — BONES (Hands & Feet)
(Simple & test-focused)
Hand Bones
Phalanges
Meaning: Finger bones.
LBA Tip: 14 total.
Metacarpals
Meaning: Palm bones.
LBA Tip: 5 of them.
Radius
Meaning: Forearm bone on thumb side.
Ulna
Meaning: Forearm bone on pinky side.
Foot Bones
Phalanges
Toe bones.
Metatarsals
Foot bones.
Tibia
Shin bone.
Fibula
Outer lower-leg bone.
Calcaneus
Heel bone.
🔑 SECTION D — MUSCLES (Simple for Nail Tech Students)
Flexors
Meaning: Muscles that bend fingers/toes.
Sentence: “Flexors help grip tools.”
LBA Tip: Bend muscles.
Extensors
Meaning: Muscles that straighten fingers/toes.
Sentence: “Extensors allow opening of the hand.”
LBA Tip: Straighten muscles.
Abductors
Meaning: Move fingers/toes apart.
Sentence: “Used during massage spreading movements.”
LBA Tip: Apart.
Adductors
Meaning: Bring fingers/toes together.
Sentence: “Important for balance in feet.”
LBA Tip: Together.
🔑 SECTION E — NERVES & CIRCULATION (Simple)
Nerves
Meaning: Carry signals for touch, pain, movement.
Sentence: “Nail plate has no nerves, but nail bed does.”
LBA Tip: Feeling system.
Blood Vessels
Meaning: Tubes that carry blood.
Sentence: “Healthy circulation supports nail growth.”
LBA Tip: Nourishment system.
Capillaries
Meaning: Tiny blood vessels.
Sentence: “Redness shows active capillaries.”
LBA Tip: Smallest vessels.
🛑 WHY ANATOMY MATTERS IN NAIL CARE (LBA TEACHING)
✔ Protects client safety
✔ Prevents injury
✔ Prevents cutting live skin
✔ Prevents damaging matrix
✔ Helps understand lifting
✔ Helps know where to apply pressure in massage
✔ Helps avoid nerves & veins
✔ Helps pass the licensing exam
At LBA we teach:
“Anatomy is knowledge.
Respect is love.
Professionalism is both.”
❤️ LBA HUMANIZATION APPROACH™ — THE BODY IS SACRED
Nail services are intimate.
You work on the body with hands and heart.
We teach students:
✔ Respect every client
✔ Move gently
✔ Understand structure
✔ Avoid pain
✔ Keep everything clean
✔ Speak kindly
Say it:
YES I CAN™ understand anatomy.
YES I CAN™ protect the matrix, nail bed, skin & nerves.
YES I CAN™ work safely and professionally.
Soon I WILL say: I HAVE DONE IT™.”
📝 50 LICENSING-STYLE QUESTIONS — CHAPTER 19
- What is the nail plate?
- What is the free edge?
- What is the nail bed?
- What is the matrix?
- What is the lunula?
- What is the eponychium?
- What is the cuticle?
- What is the hyponychium?
- What are nail folds?
- What layer forms nails?
- What is keratin?
- What is melanin?
- What is the epidermis?
- What is the dermis?
- Where are nerves located?
- Where is pain felt?
- What are phalanges?
- What are metacarpals?
- What bone is on thumb side?
- What bone is on pinky side?
- What bone is the shin?
- What is the heel bone?
- What muscles bend fingers?
- What muscles straighten fingers?
- What muscles bring fingers together?
- What muscles move fingers apart?
- Why must techs avoid cutting eponychium?
- Why protect the matrix?
- Why avoid cutting live skin?
- Why avoid filing into hyponychium?
- Why avoid applying pressure on sensitive nerves?
- Why understand anatomy?
- Why avoid product on nail folds?
- Why avoid damaging nail bed?
- Why remove cuticle?
- Why avoid buffing too aggressively?
- Why avoid over-filing?
- Why know muscle direction for massage?
- Why avoid pressure on bones?
- Why never diagnose?
- Why stop service if pain occurs?
- Why avoid causing inflammation?
- Why clean skin before product?
- Why follow nail structure when shaping?
- Why avoid hitting live tissue?
- Why work gently near nerves?
- Why know layers of skin?
- Why avoid cutting into nail plate?
- Why avoid damage to perionychium?
- What is the LBA mindset for anatomy?
📝 ANSWER KEY — CHAPTER 19
- Visible nail
- Nail beyond finger
- Skin under plate
- Nail growth area
- Half-moon
- Living skin at base
- Dead skin on plate
- Skin under free edge
- Surrounding skin
- Matrix
- Nail protein
- Skin pigment
- Outer skin
- Middle skin
- In dermis
- Dermis
- Finger bones
- Palm bones
- Radius
- Ulna
- Tibia
- Calcaneus
- Flexors
- Extensors
- Adductors
- Abductors
- It is living skin
- Controls nail growth
- Infection/injury
- Pain/injury
- Avoid discomfort
- Safety + exam success
- Causes lifting
- Pain + damage
- Adhesion
- Thins nail
- Weakens nail
- Proper massage
- Pain
- Outside scope
- Safety
- Infection risk
- Adhesion
- Natural flow
- Injury
- Sensitivity
- Safety knowledge
- Weakens nail
- Inflammation risk
- YES I CAN™ understand the body and use that knowledge to protect, care, and serve with love and professionalism.
To access the full announcement and explore all 50 chapters of THE COMPLETE NAIL LICENSING MASTER BOOK, visit:
This book is LBA’s gift to the world — a fully public, free, humanized educational resource built to uplift every learner.
YES YOU CAN.
YES YOU WILL.
YES YOU HAVE DONE IT.
