Orientation to Anatomy

Flashcards covering essential vocabulary from the introductory lecture on human body orientation, including anatomical terms, body cavities, planes, and directional terminology.

Anatomical Position

A standard body position where an individual faces forward, is upright, with arms at their sides, palms facing forward, thumbs pointing outward, and feet together. Used as a reference for directional terms.

Anatomy

The study of the structures of the body and their relationships to one another; derived from Greek roots meaning 'to cut up'.

Gross Anatomy

The study of body structures large enough to be seen without the aid of a microscope or advanced imaging.

Surface Anatomy

A subfield of gross anatomy that focuses on superficial markings on the body.

Regional Anatomy

A subfield of gross anatomy that studies the body in specific regions (e.g., head and neck, forearm).

Systemic Anatomy

A subfield of gross anatomy that studies specific organ systems (e.g., cardiovascular system).

Developmental Anatomy

The study of structural changes that occur throughout a lifespan.

Embryology

A subfield of developmental anatomy that specifically studies the structural changes from an embryo into a fetus.

Microscopic Anatomy

The study of structures that cannot be seen with the unaided eye, requiring a microscope or advanced imaging.

Cytology

The microscopic study of cells.

Histology

The microscopic study of tissues.

Physiology

The study of the function of the body; how all body parts work.

Sex

A set of biological attributes, including chromosomes, hormones, gene expression, and internal/external reproductive anatomy, typically described as male, female, or intersex.

Gender

A psychosocial construct consisting of behaviors, expressions, beliefs, and identities shaped by culture, context, and individual identity, not determined by biology alone.

Palpate

To feel or examine by touch, used to identify different textures and densities of structures.

Auscultate

To listen, typically with a stethoscope, to sounds produced by the body (e.g., heartbeat, lung sounds).

Supine

A body position where someone is lying down facing up.

Prone

A body position where someone is lying down facing down.

Superior

Towards the head or upper part of a structure.

Inferior

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

Anterior

Towards the front of the body.

Posterior

Towards the back of the body.

Dorsal

Towards the back (used interchangeably with posterior for humans but refers to the back of the hand/top of the foot).

Ventral

Towards the front (used interchangeably with anterior for humans but refers to the palm of the hand/sole of the foot).

Medial

Towards the midline of the body.

Lateral

Away from the midline of the body.

Proximal

Closer to the origin of a body part or point of attachment of a limb to the body trunk.

Distal

Further from the origin of a body part or point of attachment of a limb to the body trunk.

Superficial

Closer to the surface of the body.

Deep

Further away from the surface of the body.

Cranial

Towards the head (often used in embryology).

Caudal

Towards the tail (often used in embryology).

Axial

Referring to the head, neck, and thorax regions of the body.

Appendicular

Referring to the upper and lower limbs of the body.

Sagittal Plane

A vertical plane that divides the body into right and left halves.

Midsagittal Plane (Median Plane)

A sagittal plane that lies directly on the midline, dividing the body into equal right and left halves.

Parasagittal Plane

A sagittal plane that is offset from the midline, dividing the body into unequal right and left parts.

Frontal Plane (Coronal Plane)

A vertical plane that divides the body into anterior (front) and posterior (back) parts.

Transverse Plane (Horizontal Plane / Cross Section)

A horizontal plane that divides the body into superior (upper) and inferior (lower) parts; perpendicular to the long axis.

Longitudinal Cut

A section cut along the length or parallel to the long axis of an organ.

Oblique Cut

A section cut through an organ at any angle except a right angle.

Body Cavity

A space completely enclosed within the body, containing organs; serves to protect delicate organs and allow for changes in size/shape.

Viscera

Internal organs located within body cavities (e.g., abdominal organs, heart, lungs).

Dorsal Body Cavity

The body cavity that protects the nervous system, subdivided into the cranial and vertebral cavities.

Cranial Cavity

The body cavity housing the brain, part of the dorsal body cavity.

Vertebral Cavity

The body cavity housing the spinal cord, part of the dorsal body cavity.

Ventral Body Cavity

The body cavity housing internal organs (viscera), subdivided into the thoracic and abdominopelvic cavities.

Thoracic Cavity

The superior part of the ventral body cavity, containing the lungs (pleural cavities), heart (pericardial cavity), thymus, and great vessels (mediastinum).

Abdominopelvic Cavity

The inferior part of the ventral body cavity, containing abdominal organs and pelvic organs, separated from the thoracic cavity by the diaphragm.

Pleural Cavities

Two lateral sub-cavities within the thoracic cavity, each housing a lung.

Pericardial Cavity

A sub-cavity within the mediastinum (part of the thoracic cavity) that encloses the heart.

Mediastinum

The central compartment of the thoracic cavity, containing the heart, thymus, great vessels, trachea, and esophagus.

Diaphragm

A dome-shaped muscle that separates the thoracic and abdominopelvic cavities, crucial for respiration.

Serous Membrane

A double-layered membrane consisting of parietal and visceral portions that lines body cavities and encases viscera, reducing friction.

Parietal Portion (Serous Membrane)

The outer layer of a serous membrane that lines the wall of the body cavity.

Visceral Portion (Serous Membrane)

The inner layer of a serous membrane that directly adheres to the organ itself.

Pericardium

The serous membrane associated with the heart, consisting of the parietal pericardium (lining the pericardial cavity) and the visceral pericardium (lining the heart itself).

Pleura

The serous membrane associated with the lungs, consisting of the parietal pleura (lining the thoracic wall) and the visceral pleura (lining the lungs themselves).

Peritoneum

The double-layered serous membrane that lines the abdominal cavity and covers many abdominal organs.

Abdominopelvic Quadrants

A division of the abdominopelvic cavity into four regions: Right Upper, Left Upper, Right Lower, and Left Lower, used for clinical description.

Abdominopelvic Regions

A more detailed division of the abdominopelvic cavity into nine regions (e.g., epigastric, umbilical, hypogastric/pubic, hypochondriac, lateral lumbar, inguinal/iliac), used for precise anatomical and clinical description.