Anatomical Terminology and Body Organization: Study Notes

Surface Anatomy and Body Regions

Overview

Surface anatomy refers to the study of external features of the body that are visible or palpable. Understanding body regions is essential for describing locations of injuries, procedures, or anatomical structures.

• Abdominal: Pertaining to the abdomen.

• Acromial: Shoulder region.

• Antecubital: Front of the elbow.

• Axillary: Armpit area.

• Brachial: Arm.

• Buccal: Cheek.

• Calcaneal: Heel of the foot.

• Carpal: Wrist.

• Cephalic: Entire head.

• Cervical: Neck.

• Coxal: Hip.

• Crural: Leg (lower leg).

• Deltoid: Curve of shoulder formed by deltoid muscle.

• Digital: Fingers or toes.

• Femoral: Thigh.

• Fibular: Side of the leg.

• Frontal: Forehead.

• Gluteal: Buttock.

• Inguinal: Groin.

• Manus: Hand.

• Mental: Chin.

• Nasal: Nose.

• Occipital: Back of the head.

• Oral: Mouth.

• Orbital: Eye socket.

• Palmar: Palm of the hand.

• Patellar: Front of the knee.

• Pectoral: Chest.

• Pedal: Foot.

• Pelvic: Pelvis.

• Plantar: Sole of the foot.

• Popliteal: Back of the knee.

• Pubic: Genital region.

• Scapular: Shoulder blade.

• Sternal: Breastbone.

• Tarsal: Ankle.

• Umbilical: Navel.

Anatomical Position and Directional Terms

Introduction

The anatomical position is a standard reference posture used to describe locations and directions on the human body. Directional terms help in accurately locating anatomical structures.

• Anterior (ventral): Toward the front of the body.

• Posterior (dorsal): Toward the back of the body.

• Superior: Toward the head or upper part of a structure.

• Inferior: Away from the head or toward the lower part of a structure.

• Proximal: Closer to the origin of the body part or point of attachment.

• Distal: Farther from the origin or point of attachment.

• Medial: Toward the midline of the body.

• Lateral: Away from the midline.

• Superficial: Toward or at the body surface.

• Deep: Away from the body surface; more internal.

Abdominopelvic Quadrants

Introduction

The abdominopelvic region is divided into four quadrants to help describe locations of pain, injuries, or organs.

• Right Upper Quadrant (RUQ)

• Left Upper Quadrant (LUQ)

• Right Lower Quadrant (RLQ)

• Left Lower Quadrant (LLQ)

Example: The appendix is located in the right lower quadrant (RLQ).

Sections/Anatomical Planes

Overview

Anatomical planes are imaginary lines used to divide the body for study or medical imaging.

• Sagittal Plane: Divides the body into right and left parts.

  • Midsagittal (median): Divides the body into equal right and left halves.

  • Parasagittal: Divides the body into unequal right and left parts.

• Coronal (frontal) Plane: Divides the body into anterior and posterior parts.

• Transverse Plane: Divides the body into superior and inferior parts.

Example: MRI scans often use transverse planes to view cross-sections of the body.

Body Cavities

Introduction

Body cavities are spaces within the body that contain vital organs. They provide protection and allow organ movement and expansion.

• Dorsal Body Cavity

  • Cranial cavity: Contains the brain.

  • Vertebral (spinal) cavity: Contains the spinal cord.

• Ventral Body Cavity

  • Thoracic cavity

    • Pericardial cavity: Contains the heart.

    • Pleural cavities: Each contains a lung.

  • Abdominopelvic cavity

    • Abdominal cavity: Contains digestive organs.

    • Pelvic cavity: Contains urinary bladder, reproductive organs, and rectum.

  • Diaphragm: A muscle that separates the thoracic and abdominopelvic cavities.

Body Cavity	Main Contents	Location
Dorsal (Cranial)	Brain	Head
Dorsal (Vertebral)	Spinal Cord	Spine
Ventral (Thoracic)	Heart, Lungs	Chest
Ventral (Abdominal)	Digestive Organs	Abdomen
Ventral (Pelvic)	Bladder, Reproductive Organs, Rectum	Pelvis

Additional info: The diaphragm is a dome-shaped muscle crucial for respiration, separating the thoracic and abdominopelvic cavities.