general anatomy of skeletal muscle
TRANSCRIPT
General anatomy of skeletal muscle,
its innervation and blood supply,
General anatomy of spinal nerve,
General terms of angiology and lymphology
Miloš Grim
Institute of Anatomy, First Faculty of Medicine,
Charles University, Prague
winter semester – 2018/2019
How to study skeletal muscles: identification, muscle groups,
innervation, function, origin, insertion,
position (scheme, tables), osteofascial
spaces (compartments),
transverse sections of limb segments,
dissection
Structure of lecture
General Anatomy of Skeletal MuscleDescription of the muscle, naming of muscles, shape
and fibers architecture
Auxiliary muscle structures
General features and structure of striated muscle (origin,
Insertion, muscle fibers, myofibrils, sarcomeres, sliding filament
mechanism of contraction)
Muscle innervation - motor and proprioceptive
(motor end plate, motor unit, muscle spindle, Golgi tendon organ),
Muscle function
Origin and development of striated muscles,
molecular mechanisms
General features of peripheral mnerves
Terms of angiology and lymphology
Attachments of skeletal muscles – origin, insertion,
endomysial and perimysial sheaths, fascia
tendons, aponeuroses, neuro-vascular hilum (motor point)
myo-tendinous junction (MTJ)
pennate muscles
arrangement of parallel
running muscle fibers
Vizualization of axons and zones of motor end-plates
Acetylcholinesterase in the subneural apparatus
Muscle shape and fibers architecture
Naming of muscles IAccording to shape:
deltoid (= triangular), quadratus (= square), rhomboid
(= diamond-shaped)
teres (= round), gracilis (= slender), rectus (= straight),
lumbrical (= worm-like)
Size : major, minor, longus (= long), brevis (= short),
latissimus (= broadest), longissimus (= longest)
Number of Heads or Bellies:
biceps (= 2 heads), triceps (= 3 heads), quadriceps (= 4 heads)
digastric (= 2 bellies), biventer (= 2 bellies),
Position:
anterior, posterior, interosseous (= between bones)
supraspinous (= above spine of scapula),
infraspinous (= below spine),
dorsi (= of the back), abdominis (= of the abdomen)
pectoralis (= of the chest), brachii (= of the arm)
femoris (= of the thigh), oris (= of the mouth)
Naming of muscles IIDepth:
superficialis (= superficial), profundus (= deep),
externus (or externi), internus (or interni)
Attachment:
sternocleidomastoid
(from sternum and clavicle to mastoid process)
coracobrachialis (from the coracoid process to the arm)
Action:
extensor, flexor, abductor, adductor,
levator (= lifter), depressor,
supinator, pronator, constrictor, dilator
Fibrous sheath , synovial sheath, synovial bursa
Auxiliary sructures of striated muscles
Fascia, intermuscular septum, osteofibrous spaces
Muscle fibers
muscle fiber,
myofibril,
sarcomere
sarcoplasmic
reticulum,
T-tubules,
Triads,
mitochondria,
sarcolemma,
basal lamina
Gray´s AnatomySatellite cell
http://fig.cox.miami.edu/~cmallery/150/neuro/muscle.htm
striated muscle fibers
Sliding filament mechanism of contraction
Contraction,
Relaxation
Innervation of skeletal muscle
Neurovascular hilum
Blood supply
Motor innervation
motoneurons: slow and fast α motoneurons,
ɣ motoneurons, motor end-plate, ACh
motor unit, zone of motor end-plates,
polyneural innervation, segmental innervation
Sensory (proprioceptive) innervation
muscle spindle, Golgi tendon organ,
proprioceptive reflexes
Visualization of motor end-plates and axons,
Acetylcholinesterase in subneural apparatus
synaptic vesicles containing acetylcholine
(neurotransmitter) in axon terminal of motor end-plate;
curare blocks the transmission
Innervation of skeletal muscle: motoneurons, motor units,
motor end-plates, acetylcholine, proprioceptive neurons,
muscle spindles, Golgi tendon organs
Innervation of skeletal muscle
Spinal cord segment,
dorsal root + ventral root =
spinal nerve
Proprioceptive neurones
in spinal ganglion
α and ɣ motoneurones in
anterior horn of spinal cord
Motor end- plate,
acetylcholine, motor unit,
Muscle spindles,
Golgi tendon organ
Diagram of somatotopic distribution of motoneurons
innervating groups of upper limb and trunc muscles,
transversal section of the cervical spine
Muscle spindle
Golgi tendon organ
Electromyography (EMG)
Oliver Sacks, neurologist…“A young women with sensory
neuropathy of unknown origin who completely lost
proprioceptive sensation:
She could not stand without watching her feet,
she could not held anything in her hands, and they
wandered around without her awareness…
„Something awful´s happened, I can´t feel my body.
I feel weird-disembodied“, she said, and „I may lose
my arms. I think they´re one place and I find they´re
another“.
After having proprioception explained, she said:
„This proprioception is like the eyes of the body,
the way the body sees itself. And if it goes, as it´s gone
with me, it´s like the body is blind…so I have
to watch it - be its eyes. Right?“
Function of muscleisotonic a isometric contraction
Reciprocal innervation, synergists, antagonists,
atrophy from inactivity,
Resting tension, postural muscles, electromyography,
postcontraction relaxation, denervation atrophy of muscle,
muscle atrophy from inactivity
Voluntary motor activity controls CNS motor systems
according to information from the mechanoreceptors and
proprioreceptors and motivations developed by the limbic
system
Involuntary motor activity is based on reflex activity
Posture, isometric contraction
Motion, isotonic contraction
Muscle fiber types of skeletal muscleSlow-contracting (oxidative) and fatigue resistant fibers are
innervated by slow α motoneurones- SO – Type I
Fast-contracting (oxidative-glycolytic )and fatigue resistant
fibers are innervated by fast α motoneurones- FOG – Type IIa
Fast-contracting (glycolytic) and fibers susceptible to fatigue
are innervated by fast α motoneiurones – FG – Type IIx
Denervation atrophy of muscle fibers, atrophy of muscle
from inactivity, Hypertrophy of muscle
Muscle atrophy
Fibre Types of Skeletal Muscle• Type 1 fibres are slow-contracting and fatigue-resistant
• Type 2A fibres are fast-contracting and fatigue-resistant
• Type 2X (B) fibres are fast-contracting and susceptible
to fatigue
myosin ATPase, dehydrogenase, glycogen phosphorylase
Type I SO Type IIa FOG Type IIx FG
FG IIx FOG IIa SO I
Capillary bed of the muscle
Density and lengths of muscle capillaries
FG IIx FOG IIa SO I
Development and Differentiation
of Skeletal MuscleOrigin of myogenic cells
Myogenesis,
Myogenic determination factors
Myf-5, myogenin, MyoD and Myf-6 (herculin)
Myostatin
Muscle morphogenesis
Growth of skeletal muscle
Hypertrophy, not hyperplasia
Anabolic steroids
Myostatin
blocks
proliferation
Mutation of myostatine gene resulting in overproduction of myogenic cells
HH 25
MyoD
Epaxial and hypaxial musculature and its innervation
from dorsal and ventral branches of spinal nerves
Epaxial and hypaxial musculature and its innervation
from dorsal and ventral branches of spinal nerves
C Leg HH 22
Colonization
of the limb bud
(myogenic cells,
Schwann cells,
angioblasts,
ingrowing
axons)
QCPN Ab
HH 29
Experimental embryology
Embryonic chimera of japanese quail Q) and white leghorn chick (C)
Somite grafting, myogenic cells in limb primordium
QC
Q
C
Jacob M, Christ B,
Jacob HJ, Grim M:
(1970 – 1973)
Migration of
myogenic cells in
limb primordium
Grim M: Z. Anat-EntwGesch 132:260-71,1970
SF/HGFHH 21
Scatter factor
(plasminogen-related
growth factor) /HGF
(hepatocyte growth
factor), expression in
limb primordia
Ventral and dorsal muscle blastema in limb primordium,
their clavage in individual muscles
Desmin
Morphogenesis of limb muscles
Lbx1
Regeneration of Skeletal Muscle
Satellite cells
Muscle regeneration- activation of satellite cells
General anatomy of peripheral nervous systémSystema nervorum periphericum (PNS)
Spinal nerve, Cranial nerve, Autonomic nerves -
Sympathetic part, Parasympathetic part
Neuron, Neuroglia, Endoneurium, Perineurium, Epineurium
Synapses, Ganglion,
Afferent nerve fibers (sensory), Efferent nerve fibers
(motor), Mixed nerve , Spinal nerve plexus, Perivascular
plexus, Autonomic plexus
Segmental innervation, Radicular areas, Dermatomes,
Head´s zones (zones of reffered visceral pain), Sensory
receptors,
Peripheral nerve regeneration
Development of nervous system - neurulation
B.M. Carlson (1999)
Neural tube
Neural crest
Spinal cord
Derivatives of neural crest cells
HNK-1
Neurones of spinal ganglia, of autonomic ganglia, enteric neurons,
Schwann cells, pigment cells, cells of adrenal medulla
Spinal nervetrunk of spinal nerve - mixed nerve, rootlets,
anterior root - motor root,
posterior root - sensory root, spinal ganglion
spinal nerve plexuses,
autonomic plexuses,
perivascular plexuses
Kandel et al:
Principles of neural
science,
2000 McGraw-Hill
Segmental innervation - radicular areas (dermatomes)
Development of segmental innervation of limbs
Segmental
pattern
of muscle
innervation
Localization of motoneurons for individual muscle groups
on transverse section of cervical spinal cord
Regeneration of peripheral nerve
Regeneration of interrupted nerve fiber
Nerve graft bridging the partial defect,
suture of perineurium
peripheral nerve, endoneurium, perineurium,
epineurium
Terms
of general angiology
Vascular development, structure
of arteries, veins, lymphatic
vessel, collateral circulation
blood vessels,
arteries, veins, capillaries,
arteriovenous anastomosis,
collateral vessels,
venous plexuses,
hepatic portal vein
Venous valves
Terms of general anatomy of lymphatic systemLymph, lymph node, lymph tissue in the organs, main
lymphatic trunks, lymphatic vessels and ducts
Literature:
Platzer: Color Atlas and Textbook of Human Anatomy –
Vol.1 Locomotor System, Thieme 2008
Kahle, Frotscher: Color Atlas and Textbook of Human Anatomy –
Vol. 3 Nervous System and Sensory Organs, Thieme 2010
Stingl, Grim, Druga: Regional Anatomy, 2012
Netter: Atlas of Human Anatomy, Icon 2003
Sobotta: Atlas of Human Anatomy Vol.1+2, Williams and Wilkins
2000
Sadler: Langman´s Medical Embryology, 11th Edit. 2009
Carlson: Human embryology and developmental biology
Mescher: Junqueira´s Basic Histology 12th Edit., 2010
Different original publications in scientific journals
Author´s own figs. and illustrations
Sources of used illustrations:
Gray´s Anatomy,
Sobotta: Atlas der Anatomie des Menschen
Stingl, Grim, Druga: Regional Anatomy, 2012
Benninghoff, Drenckhahn: Anatomie I., II.
Sadler: Langman´s Medical Embryology, 11th Edit. 2009
Carlson: Human embryology and developmental biology
Čihák: Anatomie 1
Different original publications in scientific journals
Author´s own figs. and illustrations from archive
Build your muscles, build your brain