The parts of the Mid-Brain are:

MIDBRAIN
1.  Tectum Tect
   1.1.  Superior Colliculus SC
      1.1.1.  Zonal Layer of...Zo
      1.1.2.  Superficial Gray Layer of...SuG
      1.1.3.  Optic Nerve Layer of...Op
      1.1.4.  Intermediate Gray Layer of...InG
      1.1.5.  Deep Gray Layer of...DpG
      1.1.6.  Deep White Layer of...DpWh
      1.1.7.  Commissure of...csc
      1.1.8.  Brachium of...bsc
   1.2.  Inferior Colliculus IC
      1.2.1.  Central Nucleus of..CIC
         1.2.1.1.  Dorsomedial Part of..CICDM
         1.2.1.2.  Ventrolateral Part of..CICVL
         1.2.1.3.  Pericentral Nucleus of...PCIC
         1.2.1.4.  External Nucleus of..EIC
      1.2.2.  Brachium of...bic
         1.2.2.1.  Nucleus of the...BIC
         1.2.2.2.  Commissure of...cic
            1.2.2.2.1.  Recess of ReIC
   1.3.  Oculomotor Nerve and Nuclei 3NN
      1.3.1.  Oculomotor Nerve 3n
      1.3.2.  Principal Oculomotor Nucleus 3
      1.3.3.  Accesory Oculomotor Nucleus EW
         1.3.3.1.  rostral EWR
         1.3.3.2.  caudals EWC
   1.4.  Trochlear Nerve and Nuclei 4NN
      1.4.1.  Trochlear Decussation 4x
      1.4.2.  Trochlear Nerve  (Root of ...) 4n
      1.4.3.  Trochlear Nucleus 4
   1.5.  Pedunculopontine Tegmental Nucleus PPTg
   1.6.  Dorsal Tegmental Nucleus DTg
      1.6.1.  Lateral Part of.., LDTg
   1.7.  Ventral Tegmental Nucleus VTg
   1.8.  Reticular Formation- Mesencephalon RFS
      1.8.1.  Reticulotegmental Nucleus RtTg
      1.8.2.  Central tegmental Field CTF
      1.8.3.  Parabrachial tegmental Field PTF
   1.9.  Laterodorsal Tegmental Nucleus LDTg
   1.10.  Lateral Tegmental Field LTF
      1.10.1.  Gigantocellular Tegmental Field GTF
      1.10.2.  Magnocellular Tegmental Field MgTF
      1.10.3.  Reticulotegmental Nucleus RtTg
      1.10.4.  Area H AH
      1.10.5.  Nucleus L NL
   1.11.  Tectal Raphe
      1.11.1.  Interpeduncular Nucleus IP
         1.11.1.1.  Apical Part of...IPA
         1.11.1.2.  Central Part of...,IPC
         1.11.1.3.  Posterior Subnucleus of...,IPPO
            1.11.1.3.1.  Inner Part of, IPIP
            1.11.1.3.2.  Outer Part of, IPOP
            1.11.1.3.3.  Paramedian part of..., IPP
      1.11.2.  Rostral Linear Raphe Nucleus RLi
      1.11.3.  Caudal Linear Raphe Nucleus CLi
         1.11.3.1.  Nucleus raphe linearis intermedius  ILi
   1.12.  Ventral Tegmental Area VTA
   1.13.  Paranigral Nucleus PN
   1.14.  Substantia Nigra SN
      1.14.1.  Compact Part of SNC
      1.14.2.  Reticular Part of SNR
         1.14.2.1.  Lateral Part of SNL
   1.15.  Pyramidal Tract py
      1.15.1.  Ventral Tegmental Decussation vtgx
      1.15.2.  Dorsal Tegmental Decussation dtgx
2.  Pretectal Area PTec
   2.1.  Nucleus of the Optic Tract OT
   2.2.  Anterior Pretectal AreaAPT
   2.3.  Dorsal Part of...APTD
   2.4.  Ventral Part of...APTV
   2.5.  Posterior Pretectal  Nucleus PPT
   2.6.  Medial Terminal Nucleus of Accessory Optic Tract MT