Which of the following passes through the foramen magnum -
1.Vertebral artery
2.Sympathetic chain
3.XIth cranial nerve
4.Internal carotid artery
exp:
Structures passing through foramen magnum are :
Anterior part :- Apical ligament of dens, membrana tectoria, vertical band of cruciate ligament.
Posterior part :- Lowest part of medulla oblongata, three meninges (dura, arachnoid and pia mater).
Subarachnoid space :- Spinal accessory nerves, vertebral artery and sympathetic plexus around it, posterior spinal arteries, anterior spinal arteries.