First Term Material Flashcards
Anatomical planes
flat surface that passes through the body to provide a frame of reference in 3D, includes frontal plane (coronal), transverse (horizontal) plane and saggital (medial) plane
Frontal plane
(coronal plane) divides the body into anterior and posterior portions
Transverse plane
(horizontal plane) divides the body into superior and inferior portions
Saggital plane
(medial plane) divides the body into right and left segments
Front of the body terminology
ventral or anterior
Back of the body terminology
dorsal or posterior
What does cranial refer to?
superior
What does caudal refer to?
inferior
Proximal
closer to the origin
Distal
further away from the origin
4 body tissues
epithelia, nervous tissue, muscle tissue and connective tissue
Epithelia
in general, is classified based on cell morphology and number of layers
Nervous tissue
main component of the brain, spinal cord and nerves
Muscle tissue
contractile tissue controlled either voluntarily (skeletal muscle) or involuntarily (cardiac and smooth muscles)
Connective tissue
tissue that connects, supports, binds or separates other tissues or organs
Types of Connective tissue
(1) proper connective tissue - can be loose tissue functioning as a binding tissue (ex. adipose tissue) or it can be dense tissue that resists mechanical stress (ex. ligaments, tendons and deep fascia)
(2) blood - transports medium for respiratory gases, nutrients and wastes
(3) bone - supports and protects organs, attachment site for muscles
(4) cartilage - provides cushion and support (ex. hyaline cartilage covering ends of bones and fibrocartilage between intervertebral discs)
Fascia
type of connective tissue, it can be (1) superficial fascia also known as the hypodermis (below the dermis), contains adipose (loose connective tissue), fat storage, passageway for nerves and blood vessels (2) deep fascia found between adjacent muscles, no fat, dense proper connective tissue, creates compartments, surrounds individual and groups of muscles and large nerves and vessels, reduces friction during muscle contractions
Joints
articulations or sites where two or more bones meet, provides stability and / or mobility to the skeleton
Classification of joints
(1) functional - immovable, slightly movable or freely movable joints
(2) structural - fibrous, cartilaginous or synovial joint
Fibrous joint
connected by dense regular connective tissue, lacks a joint cavity
Types of fibrous joints
(1) sutures - located between skull bones, immovable
(2) syndesmoses - connected by ligaments, movement range depends on length (ligaments of fibula and tibia)
(3) gomphoses - peg-in-socket joint for root of tooth
Cartilaginous joint
bones united by cartilage, lack a joint cavity
Types of cartilaginous joints
(1) synchondroses - hyaline cartilage, immovable
(2) symphyses - fibrocartilage, slightly movable
Synovial Joint
fluid-filled joint cavity, contains synovial fluid, classified according to degree of movement and shape
Classifying synovial joint based off degrees of movement
(1) non-axial movement - gliding does not involve rotation around an axis (plane joint - ex. intercarpal joint)
(2) uni-axial movement - movement around a single axis (hinge joint - ex. elbow) (pivot joint - ex. proximal radioulnar joint in forearm)
(3) bi-axial movement - movement around two axes (condyloid joint - ex. metacarpophalangeal joint) (saddle joint - ex. carpometacarpal joint at thumb), includes flexion extension abduction and adduction
(4) multi-axial movement - movement around multiple axis (ball and socket joint - ex. shoulder), flexion, extension, abduction, adduction and rotation in all planes
Human skeleton
consists of 206 bones including the axial skeleton (80) and the appendicular skeleton (126)
Axial skeleton consists of …
skull, vertebral column, ribs, sternum
Appendicular skeleton consists of …
upper and lower limbs, shoulder girdle (attaches the upper limb to the trunk) and the pelvic girdle (attaches the lower limb to the trunk)
Girdle
attaches the bone of the appendicular skeleton to the bones of the axial skeleton
Surfaces that form joints
(1) head - bony expansion on a narrow neck
(2) facet - smooth articular surface
(3) condyle - rounded articular projection
Projections that are sites of muscle and ligament attachments
(1) process - any bony prominence
(2) tubercle - small rounded projection
(3) tuberosity - larger rounded projection (can be rough)
(4) spine - sharp slender projection
(5) crest - narrow ridge
(6) line - narrow ridge, less prominent than crest
Depressions and openings of the bones
(1) fossa - shallow depression
(2) notch - indentation on edge of structure (looks like a bit out)
(3) foramen - round / oval opening through bone
Development of vertebrate from birth
fetus only has one curvature, at birth humans have a primary thoracic and sacral curves formed, once you become a child, you develop secondary cervical and lumbar curves, development of the curvatures are important for stability and holding up the head with increasing mass
Scoliosis
abnormal lateral curvature (spine curved away from midline)
Kyphosis
exaggerated thoracic curvature
Lordosis
exaggerated lumbar curvature
Anatomy of the vertebral column
7 cervical, 12 thoracic, 5 lumbar, 1 sacral (5 bones fused together) and 1 coccyx bones (4 fused together)
Pedicle
base of the superior and inferior articular processes
Cervical vertebrae
(C1-C7), bifid spinous process (shorter) (appearance is like a dolphin fin), transverse process on each side contains a foramen in them
Axis and Atlas
axis (C2) - has a projection known as the dens and this articulates with the atlas (C1), it is a large projection that goes up and articulates with the atlas
Injury to the atlas (C1)
vertical compressive force - force from skull onto the atlas, coming from above onto the skull causing a Jefferson fracture (burst), can occur from diving into shallow water, drives the base of the atlas and the posterior and anterior portions of the atlas detach
Injury to the axis (C2)
hyperextension of the head and neck can cause of traumatic spondylosis of C2 in a Hangman’s fracture, neck is in place and the head is forcefully extended, involves breaking between the inferior and superior articular processes of C2
Thoracic vertebrae
(T1-T12), the spinous processes are exaggerated (much longer), principle responsibility is interacting with the ribs, articulates with the ribs
Thoracic vertebrae and the ribs - articulation
ribs touch the spine in 3 locations - touching two vertebrae and a transverse costal facet, the transverse vertebrae contain a superior and inferior demifacet on each vertebrae and these are known as the superior costal facet and inferior costal facet, the head of the rib articulates with the inferior costal facet of the superior vertebra and the superior costal facet of the inferior vertebra, 3rd point of contact is the tubercle of the rib articulates with the transverse costal facet of the transverse process of the inferior vertebra
Costal groove
ribs offer protection for vessels that run in the costal groove (located on the lower inside of each rib)
Costal cartilage
attaches bone of the ribs to the sternum
Sternum
manubrium, the body of the sternum and the xiphoid process
Manubrium articulates with …
the first rib