QS Study

Emissary veins: The venous-channels which make a connection between intracranial venous sinuses and extracranial veins are called emissary’s veins. They are valveless and pass through some cranial foramina to communicate the intra-cranial with extra-cranial veins. They are one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull. Clinically, emissary veins may pass on infected thrombus from the exterior to the interior of the cranial cavity. Some of the veins are constant, while others are variable.

Emissary’s veins include the:

  • ophthalmic (superior & inferior)
  • sphenoidal
  • parietal
  • mastoid
  • occipital
  • condylar.

Emissary Veins 2

Fig: Emissary Veins

Emissary veins connecting cavernous sinus with pterygoid venous plexus are as follows:

(a) Veins of the foramen ovale;

(b) Veins of the foramen spinosum;

(c) Veins of the foramen Vesalii;

(d) Veins of the foramen lacerum.

Different emissary veins are described below:

Sites of communication of extra & intracranial veins –

Emissary Veins 1

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