The Human Body: An Orientation Part B

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Presentation transcript:

The Human Body: An Orientation Part B 1

Anatomical Position Body erect, feet slightly apart, palms facing forward, thumbs point away from body Figure 1.7a

Superior and inferior – toward and away from the head, respectively Directional Terms Superior and inferior – toward and away from the head, respectively Anterior and posterior – toward the front and back of the body Medial, lateral, and intermediate – toward the midline, away from the midline, and between a more medial and lateral structure

Superficial and deep – toward and away from the body surface Directional Terms Proximal and distal – closer to and farther from the origin of the body Superficial and deep – toward and away from the body surface

Directional Terms Table 1.1

Directional Terms Table 1.1

Regional Terms: Anterior View Axial – head, neck, and trunk Appendicular – appendages or limbs Specific regional terminology Figure 1.7a

Regional Terms: Posterior View Figure 1.7b

Body Planes Sagittal – divides the body into right and left parts Frontal or coronal – divides the body into anterior and posterior parts Transverse – divides the body into superior and inferior parts Transverse Plane

Sagittal Plane Sagittal – divides the body into right and left parts Midsagittal Plane – lies exactly in the midline

Sagittal Plane

Frontal or Coronal Plane Frontal or coronal – divides the body into anterior and posterior parts (front and back) Lies vertically

Frontal or Coronal Plane

Transverse Plane Transverse or horizontal (cross section) – divides the body into superior and inferior parts

Transverse Plane

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

What type of plane was this image taken from?

Body Planes

Anatomical Variability Humans vary slightly in both external and internal anatomy Over 90% of all anatomical structures match textbook descriptions, but: Nerves or blood vessels may be somewhat out of place Small muscles may be missing Extreme anatomical variations are seldom seen

Body Cavities Dorsal cavity protects the nervous system, and is divided into two subdivisions Cranial cavity is within the skull and encases the brain Vertebral cavity runs within the vertebral column and encases the spinal cord Ventral cavity houses the internal organs (viscera), and is divided into two subdivisions: thoracic and abdominopelvic

Body Planes

Body Planes

Body Cavities Thoracic cavity is subdivided into pleural cavities, the mediastinum, and the pericardial cavity Pleural cavities – each houses a lung Mediastinum – contains the pericardial cavity, and surrounds the remaining thoracic organs Pericardial cavity – encloses the heart

It is composed of two subdivisions Body Cavities The abdominopelvic cavity is separated from the superior thoracic cavity by the dome-shaped diaphragm It is composed of two subdivisions Abdominal cavity – contains the stomach, intestines, spleen, liver, and other organs Pelvic cavity – lies within the pelvis and contains the bladder, reproductive organs, and rectum

Abdominopelvic Retions Umbilical Epigastric Hypogastric Right and left iliac or inguinal Right and left lumbar Right and left hypochondriac Figure 1.11a

Organs of the Abdominopelvic Regions Figure 1.11b

Abdominopelvic Quadrants Right upper Left upper Right lower Left lower Figure 1.12