Radovan Hudak, David Kachlik Ondre j Voln4 et al


Eff ectors •   1 Receptor



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Eff ectors

 



Receptor

 



Aff erent branch 

 



Neurons within the CNS

 



Eff erent branch

 



Eff ector

1

2



3

5

4



The refl ex arc

Memorix Anatomy book.indb   338

18. 2. 2016   17:40:55



339

11

Spinal nerves – Nervi spinales

2

– are thinner and shorter than the anterior branches



– innervate the posterior (epaxial) part of the trunk 

– provide motor innervati on for the epaxial muscles of the back 

– provide sensory innervati on for the skin of the nape, back and butt ocks 

– retain segmental organisati on 

 

Suboccipital nerve (nervus suboccipitalis) – the posterior branch of C1



      – a purely motor nerve for the suboccipital

        muscles and the semispinalis capiti s

 

Greater occipital nerve (nervus occipitalis major



      – the posterior branch of C2 

      – a purely somatosensory nerve for the skin posterior to the

        interauricular line (a line joining the auricles in the frontal plane)

 



Third occipital nerve (nervus occipitalis terti us) 

   – the posterior branch of C3

      – a purely somatosensory nerve innervati ng a narrow area

         of the skin medial to the greater occipital nerve 

 

 



Superior clunial nerves (nervi clunium superiores)

      – the posterior branches of L1 to L3

      – provides somatosensory innervati on of the superior gluteal region 

 

 



Middle clunial nerves (nervi clunium medii)

      – the posterior branches of S1 to S3

      – provides somatosensory innervati on of part of the gluteal region 

– are longer and thicker branches than the posterior branches

– provide both motor and sensory innervati on

  of the limbs and the hypaxial part of the trunk 

– provide motor innervati on of the muscles of the anterior abdomen, 

  thorax and neck (except for the suprahyoid muscles)

– provide sensory innervati on of the skin on the anterior

  aspect of the abdomen and thorax 

 

Cervical plexus (plexus cervicalis) – C1 to C4



 

Brachial plexus (plexus brachialis) – C4 to T1 



 

Thoracic nerves (nervi thoracici) – T1 to T12 



 

Lumbar plexus (plexus lumbalis) – T12 to L4



 

Sacral plexus (plexus sacralis) – L4 and L5 and S1 to S4



    6 Coccygeal plexus (plexus coccygeus) – S5 and Co


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