Lecture 14-15 Flashcards
Skelton outer is considered
somatic; and associated w/ somatopleure
Skelton inner is considered
visceral; and associated w/ splanchnopleure
Mesenchyme
embryonic connective tissue
Chondrocranium (1st division)
base of skull; cradles brain. (endochondral formation)
mesoderm
caudal to notochord:
post-chordal cartilages are derived from Paraxial Mesoderm
Endochondral Ossification
using a cartilage model
Intramembranous
does not need a cartilage model
Dermatocranium
membranous, flat bones, intramembranous ossification
Flat bones of roof (dermal bone)
(Germ Layer: neural crest)
Splanchocranium
aka visceraocranium, contribute to facial bones: maxillae, mandible, temporal, occipital, sphenoid, zygomatic
derived from visceral arches (endochondral formation)
(germ layer: neural crest)
Visceral Skeleton
support from pharyngeal arches
How many somitomeres
7
Neuroectoderm gives rise to
vertebrate structures
Occipital somites contribute to
head: bone and muscle
Mandibular Arch gives rise to
mandible
Where are somitomeres located and where are somites located
somitomeres: head region; somites: trunk
Any visceral arises from
neural crest
Mandibular Arch
branchial arch I
Hyoid Arch
Branchial Arch II
Branchial Cartilages develop in
Pharynx and gives rise to splanchnocranium
manidbular arch contributed to development of
manidble, incus and malleus
Hyoid arch contributed to development of
hyoid, styloid process and laryngeal cartilages
Bones of the cranial roof appear as
intramembranous ossification which occurs in dermis
Facial bones protect and support the entrances to the
digestive and respiratory tracts
cranial bones______
surround and protect the brain
Ethnoid bone is the pathway for ____
olfactory nerve
styloid process is derived from
visceral skeleton
Sphenoid bone is the pathway for_____
optic canal, foramen rotundum, foramen lacerum, foramen ovale, foramen spinosum
Temporal bone is the pathway for____
carotid canal and internal acoustic meatus
Occipital bone is the pathway for_____
foramen magnum, hypoglossal canal and jugular foramen
Dermal bones
Maxillae, zygomatic bones, lacrimal bones
all intramembranous ossification, neural crest cell origin
Zygomatic arch is made up of
zygomatic process of temporal bone and zygomatic process of zygomatic bone
auditory ossicles are considered
splanchnocranium
nasal bones make up
nasal complex
NOT orbital
Pituitary Gland Anterior lobe
synthesizes hormones which are released under the direction of the hypothalamus
Pituitary Gland Posterior lobe
releases hormones which are synthesized by the hypothalamus
Branchial Skeleton
origin in early photo-vertebrates, supports pharynx,, series of skeletal elements= ‘arches’
function: respiration , filter feeding
mandible forms a ____ articulation with cranial skeleton
movable
columella
transmission of sound from jaw to ear
3 middle ear bones
malleus, incus, and stapes
Mandibular arch
Branchial Arch I
Hyoid Arch
Branchial Arch II
Mandibular arch gives rise to which middle ear bones
malleus and incus
Hyoid Arch gives rise to which middle ear bone
stapes
Placodes
special sense organs (nose, eye and ear)
Neurogenic
capable of forming neurons
Olfactory Placode
develop into sensory neurons; the axons form bundles that ever the olfactory foramina of the cribriform plate of the ethmoid bone
Optic Placode
Future lens of the eye
Vestibulocochlear nerve
balance and equilibrium
myotomes of the pre otic somites form the muscles that
move the eyeballs
the sclerotomes of the post otic somites form the
floor of the brain case
and their myotomes develop into muscle of the tongue
ventricles is lined with and filled with
ependymal cells; cerebrospinal fluid
dural sinuses
large collecting veins within folds of dura mater
falx cerebri
contains superior and inferior sagittal sinuses
falx cerebri attaches to
crista galli (ethnoid bone)
cerebrospinal fluid function:
cushion and suspend brain
choroid plexus importance:
blood brain barrier
medulla oblongata
communication between spinal cord and brain; controls visceral and autonomic functions
Tracts
groups of axons
Pons
respiratory center
cerebellum
posture and automatic processing
white matter ____ info
transmits
grey matter ____ info
receives
Thalamus
sensory info
Hypothalamus
emotion
diencephalon connects the brain stem to
cerebral hemispheres
cerebrum
processing sensory and motor info, speech and thought
75% of the sympathetic is due because of the _____ nerve
vagus
Dorsal roots of cranial nerves are
sensory
Ventral roots of cranial nerves are
motor
Retina’s 2 receptors
rods and cones
Rods
night vision
cones
bright lights and colors
pupil
allows light to enter eye
movement of cue is controlled by
extrinsic muscles and 4 cranial nerves
3 tunic layers of the eye
fibrous, vascular, and neural
fibrous tunic layer
external layer: sclera and cornea (allows light to enter)
Vascular Tunic layer
middle layer; colliery body, iris (adjusts shape of lens, pigmented portion)
Neural Tunic Layer
Inner layer (retina)
Retina
contains photoreceptors (rods and cones)
Tympanic membrane
ear drum
Auditory ossicles
malleus, incus, stapes
3 components of inner ear
vestibule, cochlea, and three semicircular canals
lacrimal gland
tear ducts
refracted
bent
how many types of cones
3: blue, green, red
tympanic cavity is filled with
air
hair cells in semicircular ducts
receptors
spiral organ on basilar membrane contains rows of
hair cells with sterocilia
hearing
perception of sound
frequencies is measured in
hertz, number of waves
amplitude is measured in
decibels, height of waves
intensity is
amount of energy in a wave
gustation
receptors in taste buds
vertebrate eye aka the
camera eye (lens focuses light on retina)
Buccal phase
tongue pushes food toward pharynx
Pharyngeal phase
epiglottis closed
esophageal phase
forces food down throat
larynx
voicebox
cell association patterns
epithelial and mesenchymal
Epithelial
organized cellular structure
derived from ectoderm and endoderm.
Mesenchymal
disorderly, loosely organized cellular structure.
derived from mesoderm, so cells are able to move easier
Chordate 6 features
DHNT, notochord, pharyngeal slits, segmented body muscle, post anal tail and endostyle
Vertebrae features
chordates + neural crest and vertebral column
gastrulation
gives rise to 3 primary layers: ectoderm, mesoderm, and endoderm.
Neurulation
gives rise to dorsal hallow (neural folds) nerve tube occurs same time with notochord
Neural Crest
4th germ layer, came from neural form
Serous Membrane:
Parietal and visceral
Parietal Layer
covers lining of cavities
Visceral layer
covers lining of organs
Journey of Keratinocyte
keratinocyte are the body’s most abundant epithelial cells. It takes about a week for a cell to move from basal to skin. From stratum spinosum, stratum granulosum, then stratum corneum
Tight junctions
prevents passage of water and solutes
Gap Junction
allows for rapid communication, held together by channel proteins
Desmosomes
very strong, ties cells together
Endochondral Ossification uses a
pres existing cartilage membrane to ossify bone. (occurs in its outer surface)
Intramembranous ossification uses
direct mysenchymal cells to ossify bone. (occurs inside the cell for future bone)
Osteoblast
create new bone cells
Osteoclast
destroys bone cells
osteocytes
take care of bone cells
Which bones make up the pectoral girdle
clavicle and scapula
How the pectoral girdle articulate
it does not have a direct bony connection to the vertebral column, this set up gives us a range of motion because it is supported by muscular attachments that allows us to move since it does involve most of our upper body bones.
Which bones make up the pelvic girdle
illium, ischum and pubis.
How does pelvic girdle articulate
acetabulum of the femur
Stylopod
humerus, femur
Zeugopod
radius, ulna, tibia, fibula
Autopod
carpals and tarsals
re segmentation
successful formation of vertebral disks, 1/2 is composed of somites and 1/2 of neighboring somites which makes vertebral column able to move
membrane potential
chemical gradients and the electrical gradients favor entry of Na+ into cell
Na+ are attracted to the negative charges inside of cell
graded potential
a change in membrane potential that tends to dissipate
action potential
a change that is propagated
Na+/K+ pump
3 Na+ out and 2 K+ in
Balances passive forces of diffusion and controls cell permeability
Ion required for depolarization
Na+
Na+ is associated with
voltage gated
Ion required to release Ach
Ca++
Ca++ is associated with
voltage gated channel
Depolarization
resting membrane potential towards a more positive value
K+
chemically gated
dorsal root ganglion
contains cell bodies of sensory neurons relaying information to PNS
Somatic Nervous System
voluntary (skeletal muscles)
Autonomic Nervous System
Involuntary (internal organs and glands)
Sympathetic of ANS
fight or flight
Parasympathetic of ANS
rest and digest
Dorsal Root Ganglia contains
motor neurons
Ventral Root Ganglia contains
Sensory neurons
Gray Matter
surrounds central canal
white matter
superficial
sacromere
arrangement of thin filaments where actin and myosin are present
Myofilaments
Myosin and actin
Thin filaments
Actin
Thick filaments
Myosin
ATP required for ____ detachment
Cross bridge
Sarcoplasm
cytoplasm of muscle fiber
Sacroplasmic Reticulum
calcium releases (by triad) neurotransmitters and triggers muscle contractions
muscles of rotator cuff
supraspinatus, subscapularis, infraspinatus and teres minor
trapezius muscle
orginally had a visceral function,now it has somatic function
major nerves of brachial plexus
radial and ulnar
cross bridge activates
myosin
lumbosacral plexus
obturator
Expaxial
extend
hypaxial
flex
somite 3 regions
myotome, dermatome and sclerotome
sclerotome gives rise to
axial skeleton
ventral? rami forms
plexus
somatopleure
somatic, parietal serosa
splanchopleure
visceral, viscersal serosa
folia
cortex of cerebellum
corpus collosum
connects hemispheres
meninges
dura mater, pia mater, arcnoid
girus
ridges in brain
teres major
subscapular nerve
teres minor
axillary nerve
knee flexors
siatic
stereocilia
present on apical surface of hair cells, some hair cells also have one kinocilium.
stereocilia contacts the tectorial membrane causing a distortion leading to AP
deglutition
food being chewed up
dorsal scapular nerve
levator
accessory nerve
trapezius