3. Back & hip anatomy Flashcards
Cervical Vertebrae
(7); flex, ext, rot, lat flex
Thoracic Vertebrae
(12); flex, ext; Transverse processes have rib facets
Lumbar Vertebrae
(5); flex, ext, rot, lat flex
Sacrum
S1-S5 fused
Coccyx
C1-C5 fused; no cord; tailbone
Vertebral body
Weight-bearing part of vertebra
Vertebral arch
2 pedicles & lamina; surrounds spinal cord
Vertebral foramen
Space within vertebral arch
Intervertebral foramen
opening between vertebrae on each side of column where spinal nerves exit
Vertebral processes
Transverse (2); spinous (1)
Superior facets
Non-weight bearing
Inferior facets
Non-weight bearing
Anterior longitudinal lig
Runs along ANTERIOR of body; limits extension
Posterior longitudinal lig.
Runs along POSTERIOR of body; limits flexion; next to spinal cord
Ligamentum flavum
Connects lamina to lamina; limits flexion
Supraspinous lig.
Connects TIPS OF SPINOUS PROCESSES; limits flexion; PALPABLE
Interspinous lig.
Connects spinous processes; limits flexion
Intertransverse lig.
Connects transverse processes; LIMITS LAT FLEX ON OPPOSITE SIDE
Intervertebral disc
Annular fibrous (outer ring); Nucleus pulposus (inner ring); Avascular; no nerve supply; Lumbar thicker, allowing greater mobility
Superficial posterior muscles
Latissimus dorsi (ext); Trapezius (ext); Rhomboids (major & minor)
Deep posterior muscles
Paraspinals; Erector spinae
Erector spinae muscles
(Lateral = iliocostalis; Middle = Longissimus; Medial = Spinalis); Maintains erect posture; rotates trunk
Anterior muscles
Rectus abdominus; Transverse abdominis; External oblique; Internal oblique
Rectus abdominus
Maintains posture; trunk flexion; lat flexion
Transverse abdominis
Maintains posture
External oblique
Maintains posture; Lat flexion; rotation
Internal oblique
Maintains posture; Lat flexion; rotation
Internal intercostal Muscles
Expiration; run laterally; deep
External intercostal muscles
Inspiration; run medially; superficial
General nerve pathway out of Spinal Cord
Spinal roots > Spinal nerves > Rami
Are spinal nerves sensory, motor, or mixed?
Mixed
Posterior rami
Supplies deep muscles & skin of posterior trunk; T2-T12
Anterior rami
Supplies lower & upper limbs. Lateral and anterior trunk > intercostal nerves
Meningeal branch
Branches off spinal nerve, reenters thru intervertebral foramen, and innervates vertebra, lig, vessels, & meninges
Plexus
Network of nerves formed by anterior rami
Lumbar Plexus
L1-L4; Gives rise to femoral nerve & obturator nerve
Femoral nerve
Innervates thigh flexors and knee extenders
Obturator nerve
Innervates leg adductors
Sacral plexus
L4-S4; Gives rise to Gluteal, Pudendal, Thigh, and Sciatic nerves
Sciatic nerve
Posterior nerve of leg; Gives rise to Common Peroneal (fibular) n., Superficial peroneal/fibular n.; Deep peroneal/fibular n., and Tibial n.
Lumbosacral plexus
Lumbar and sacral plexi combined
Conus Medullaris
Ends between L1 & L2
Filum Terminale
Extension of pia mater that attaches to coccyx
Cauda equina
Lumbar/sacral nerve roots as they travel in vertebral canal below spinal cord
Pelvis
2 Innominate bones fused
Important landmarks of pubis
Inferior ramus; Superior ramus; Crest of pubis; Pubic symphysis
Important landmarks of ilium
ASIS; PSIS; AIIS; PIIS; Greater sciatic notch
Important landmarks of ischium
Ischial tuberosity; Lesser sciatic notch
Acetabulum
Hip socket; fusion of pubis, ilium, ischium; Opens lat, inf, ant.
Acetabulum Labrum
Lines & deepens socket
Sacroiliac (SI) Joint
PSIS & spinous processes; dimple of buttocks; ant/post movements only; Trunk flex > post movement; Trunk ext > ant movement
Ischial-Femoral Joint
Ball in socket; Femoral head; Acetabular labrum; capsule; HIP JOINT
Pubic Symphysis
Fibrocartilaginous disc; 3 stabilizing ligaments (Superior/Inferior/ Posterior)
Trochanteric bursa
Between bone & skin
Iliopsoas Bursa
Between bone and psoas
Ischial tuberosity bursa
Between tuberosity and skin
False Pelvis
Between iliac wings
True pelvis
Between ischial & pubic bones
Hip Ligaments
Ischiofemoral; Pubofemoral; Iliofemoral; all twisted in anatomical position; straighten during hip flexion
Superficial Hip/Pelvic Muscles
Gluteus maximus; Hamstrings
Gluteus maximus
Extend hip when knee is flexed
Hamstrings
Hip extension w/ knee extended; 3 muscles
3 Hamstring Muscles
Biceps femoris (lateral); Semitendinosus (med); Semimembranosus (Med)
Deep Hip Muscles
External rotators; Piriformis; Obturator internus/externus; Sup & Inf Gemellus; Quadratus femoris; Gluteus medius
Anterior hip muscles
Psoas; Iliacus; Obturator externus; Rectus femoris; Sartorius; Pectineus
Psoas
Sitting flexion
Iliacus
Sitting flexion
Obturator externus
ER of hip
Rectus femoris
Supine flexion
Sartorius
Flex, abd, ER
Pectineus
Add, flex
Medial hip muscles
Adductors; Gracilis; Adductor magnus/brevis/longus
Lateral hip muscles
Abductors; Gluteus minimus & medius; Tensor fascia latae
Primary posterior hip nerve
Sciatic n.
Primary anterior hip nerve
Femoral n.
Branches of sciatic n.
Tibial n. & Common peroneal/fibular n.
Posterior hip dislocation nerve impingement
Sciatic n.
Anterior hip dislocation nerve impingement
Femoral n.
Blood supply of Hips
External Iliac Artery
Branches of External Iliac Artery
Femoral and deep femoral aa.
Assessing True Leg Length
Measure from ASIS to MEDIAL malleolus
Assessing Apparent Leg Length
Measure from Umbilicus to MEDIAL malleolus
Borders of inguinal triangle
Sartorius (lateral), Adductor longus (Medial); Inguinal ligament (superior)
Motor Tracts (Descending)
Corticospinal (lateral & ventral); Corticobulbar (facial)
Sensory Tracts (Ascending)
Spinal Thalamic (Lat & Ant); Dorsal Columns
Lateral Spinal Thalamic Tract
Pain & temp
Anterior Spinal Thalamic Tract
Crude touch & pressure
Dorsal Columns
Fine touch, light pressure, vibration, joint position