Peds Flashcards
Primary flexion curves of thoracic and pelvis caused by
Flexion position of embryo
Extension curves in cervical and lumbar regions due to
Functional muscle development (erector spinae muslces)
Spinal cords ends where?
24 fetal weeks?
At birth?
Adult?
S1
L3
L1
What do ribs begin as? What happens later? Diaphragm insertion?
Ribs begin as cartilage and are horizontal in infants
Progress towards bucket/pump handle as child grows
Diaphragm inserts horizontally on inner surface of ribs in infant instead of obliquely as in adults
Infants have anterior, posterior, 2 mastoid, and 2 sphenoid fontanels. Posterior closes when? ANterior closes when?
Posterior by 2 months
Anterior by 2 years
Describe flexion of basicranium
30 degrees in infants
51 in adults
basicranial flexion relates supralaryngeal space
Describe temporal changes, specifically petrous portion
At birth, temporal bone in 3 parts
Petrous portion houses acoustical vestibular organ
Growth: rotates external auditory meatus into sagittal plane. Tips Eustachian tube from horizontal position to oblique angle
Most cranial nerves pass through this bone: CN3-11
What is a common cause of cranial dysfunction in infants? Most susceptible ?
Birth trauma
Head accommodates to pelvic outlet during birth
Occiput most susceptible
CN VI and CN VII may be injured during forceps delivery. Results?
CNVI = lateral rectus palsy, nystagmus CNVII = facial palsy, smooth forehead, inability to fully close eye
CNs 9-12 may be impinged by occipital bone dysfunction. Results?
Jugular foramen (9-11) CN9 = poor sucking CN10 = excessive vomiting/spitting up CN11 = colic, poor sucking, often affected by occiptal-temporal bone dysfunction
Hypoglossal canal
CN12 = poor sucking due to infant’s difficulty moving tongue = cannot suckle properly
What is associated with increased incidence of otitis media? Why? How to diagnose?
Internal rotation of temporal bone
Impairment of middle ear drainage due to Eustachian tube blockage
Cradle occiput in hands and gently place tips of index fingers on mastoid portion/attachment of SCM muscle. If one side is more prominent, then there is internal rotation
What happens in toddlers (1-4 years)?
Ossification increases
Some bones become fused
What happens in school age children?
Cranium fully ossified
Epiphyseal plates still open
Rapid growth taking place in long bones = growing pains
May develop leg length discrepancy = short leg syndrome or functional scoliosis
Describe the 3 types of growth areas
Epiphyseal growth plate
Proximal/distal end of bone
Made of hyaline cartilage
Epiphysis/articular surface
Made ofhylaine cartilage
Apophysis
Area of cartilaginous growth at insertion of tendon
Made of fibrocartilage
Creates bony tubercles like tibial tubercle or AIIS
Apophysitis, avulsion fractures more common in peds because of unossified apophysis
What are hyaline and fibrocartilage more vulnerable to?
Hyaline = loading and compression Fibrocartilage = tensile forces and shearing
Describe Wollf’s law
Mechanical stressors will affect tissue differentiation and growth characteristics of MSK tissues
Normal compression stimulates growth (condrogenesis and epiphyseal plate growth)
Affect collagen synthesis = increase tissue strength and ability to absorb energy
Excessive compression = osteogenesis decreased epiphyseal growth
MSK most vulnerable to mechanical forces during periods of growth