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Flashcards in this deck (23)

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  • What are the four main functional compartments of the neck?

    • Visceral compartment (anterior)
    • Vertebral compartment (posterior)
    • Two vascular compartments (lateral)
    anatomy neck compartments

  • Which structures are contained in the visceral compartment of the neck?

    • Trachea
    • Esophagus
    • Thyroid gland
    anatomy visceral neck

  • What does the vertebral compartment of the neck contain?

    • Cervical vertebrae
    • Spinal cord
    • Cervical nerves
    • Muscles associated with the vertebral column
    anatomy vertebral neck

  • What is contained in each lateral vascular compartment of the neck?

    • Major blood vessels
    • Vagus nerve
    anatomy vascular neck

  • How is the cervical fascia broadly divided?

    • Superficial fascia (thin lamina)
    • Deep fascia (four laminae)
    anatomy fascia cervical

  • Describe the superficial fascia of the neck.

    • Thin lamina joined to dermis and deep fascia
    • Contains the platysma muscle
    • Often hardly demonstrable as a separate layer
    anatomy superficial fascia

  • What is a key overall feature of the investing layer of the deep cervical fascia?

    • It completely encircles the neck
    anatomy investing fascia

  • Which two muscles are enclosed by splits of the investing layer?

    • Sternocleidomastoid (SCM)
    • Trapezius
    anatomy investing muscles

  • Where does the investing layer attach superiorly, posteriorly, and inferiorly?

    • Superiorly: base of the skull (splits to enclose salivary glands and forms stylomandibular ligament)
    • Posteriorly: nuchal ligament and C7 spinous process
    • Inferiorly: manubrium, clavicle, and acromion
    anatomy investing attachments

  • What role does the investing layer play over the neck triangles?

    • It forms the roof over both the anterior and posterior triangles of the neck
    anatomy investing triangles

  • Which structures pierce the investing layer of the deep fascia?

    • External and anterior jugular veins
    • Branches of the cervical plexus: lesser occipital, great auricular, transverse cervical, supraclavicular nerves
    anatomy investing nerves

  • How is the pretracheal layer of deep fascia described in relation to the larynx?

    • A very thin layer located below the larynx
    anatomy pretracheal fascia

  • What structures does the pretracheal fascia provide a fine fascial sheath for?

    • Trachea
    • Esophagus
    • Thyroid gland
    fascial pretracheal

  • To what does the pretracheal fascia attach superiorly and where does it continue inferiorly?

    • Superior attachment: Cricoid cartilage
    • Inferior continuation: Superior mediastinum
    pretracheal attachments

  • What is the buccopharyngeal fascia in relation to the pretracheal layer?

    • Posterior portion of the pretracheal layer
    buccopharyngeal pretracheal

  • Which structures does the prevertebral layer (lamina) surround?

    • Vertebral column and associated muscles, including:
    • Prevertebral muscles
    • Scalene muscles (anterior, middle, posterior)
    • Deep back muscles
    prevertebral muscles

  • What anatomical role does the prevertebral layer serve in the posterior triangle of the neck?

    • Forms the fascial floor of the posterior triangle of the neck
    prevertebral posterior

  • Where does the prevertebral layer attach superiorly and what does it blend with inferiorly?

    • Superior attachment: Base of the skull
    • Inferiorly blends with: Anterior longitudinal ligament in the superior mediastinum
    prevertebral attachments

  • What three structures are enclosed by the carotid sheath?

    • Common carotid artery
    • Internal jugular vein
    • Vagus nerve
    carotid vasculature

  • Which muscles are enclosed by the investing fascia?

    • Sternocleidomastoid
    • Trapezius
    investing muscles

  • Which muscles are described as being in the anterior neck and associated with the pretracheal and investing layers?

    • Infrahyoid muscles
    infrahyoid anterior

  • Where is the retropharyngeal space located?

    • Between the pharynx (buccopharyngeal fascia) and the prevertebral lamina
    spaces retropharyngeal

  • Where is the pretracheal space located?

    • Anterior to the trachea, within the pretracheal fascia
    spaces pretracheal
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Neck compartments

  • The neck is organized by a continuous investing fascia into four functional compartments:
  • Visceral (anterior): trachea, esophagus, thyroid — digestive, respiratory, endocrine structures.
  • Vertebral (posterior): cervical vertebrae, spinal cord, cervical nerves, and vertebral column muscles.
  • Vascular (two lateral): each carotid sheath with major vessels and vagus nerve.

Cervical fascia — overview

  • Fascia is divided into superficial fascia and a multilayered deep fascia (four laminae).
  • These fascial layers create boundaries that guide spread of infection and define surgical planes.

Superficial fascia

  • Thin layer adherent to dermis and deep fascia; contains the platysma.
  • Often indistinct clinically and merged with investing fascia in places.

Deep fascia — four layers

1) Investing layer

  • Encircles the neck and splits to enclose the sternocleidomastoid (SCM) and trapezius.
  • Superior attachments: base of skull; inferior attachments: manubrium, clavicle, acromion; posteriorly to the nuchal ligament and C7 spinous process.
  • Splits around parotid and submandibular glands and contributes to the stylomandibular ligament.
  • Forms the roof of the anterior and posterior triangles.
  • Structures piercing it: external and anterior jugular veins and sensory branches of the cervical plexus (lesser occipital, great auricular, transverse cervical, supraclavicular).

2) Pretracheal layer

  • Thin layer in the anterior neck that forms a fascial sheath for the trachea, esophagus, and thyroid.
  • Posterior portion = buccopharyngeal fascia covering the pharynx.
  • Extends inferiorly into the superior mediastinum and attaches superiorly near the cricoid cartilage.

3) Prevertebral layer

  • Encloses the vertebral column and deep neck muscles (prevertebral muscles and the three scalenes).
  • Forms the floor of the posterior triangle.
  • Runs from the skull base down to the superior mediastinum and blends with the anterior longitudinal ligament.

4) Carotid sheaths

  • Vertical tubular fascial condensations on each side containing the common carotid artery, internal jugular vein, and vagus nerve.

Key muscles and fascial relationships

  • Within investing fascia: sternocleidomastoid and trapezius.
  • Anterior (infrahyoid) muscles: lie in relation to the pretracheal and investing layers.
  • Vertebral muscles: prevertebral and scalene muscles reside inside the prevertebral layer.

Important anatomical spaces

  • Retropharyngeal space: between the buccopharyngeal fascia (anterior) and the prevertebral layer (posterior); a potential route for infections to track from the pharynx into the mediastinum.
  • Pretracheal space: anterior to the trachea within pretracheal fascia; communicates with superior mediastinum.

Clinical relevance — concise points

  • Fascial planes guide spread of infection: retropharyngeal infections can descend to the posterior mediastinum.
  • Carotid sheath anatomy is essential for central venous access and avoiding vascular/nerve injury (IJ vein lies lateral to common carotid; vagus nerve lies posteriorly between them).
  • Piercing points of the investing fascia are surgical landmarks for superficial nerve blocks and for recognizing pathways of cutaneous sensory branches.
  • Knowledge of attachments (skull base, manubrium, clavicle, C7) helps in reconstructive and neck dissections.

High-yield summary

  • The investing fascia divides the neck into visceral, vertebral, and two vascular compartments; deep fascia (investing, pretracheal, prevertebral, carotid sheaths) defines muscle layers and spaces important for spread of infection and surgical approaches.